diff --git a/analysis/analysis-api-fe10/tests-gen/org/jetbrains/kotlin/analysis/api/fe10/test/cases/generated/cases/references/Fe10IdeNormalAnalysisSourceModuleReferenceResolveTestGenerated.java b/analysis/analysis-api-fe10/tests-gen/org/jetbrains/kotlin/analysis/api/fe10/test/cases/generated/cases/references/Fe10IdeNormalAnalysisSourceModuleReferenceResolveTestGenerated.java
index ede2a54dee4..dced2a1c26b 100644
--- a/analysis/analysis-api-fe10/tests-gen/org/jetbrains/kotlin/analysis/api/fe10/test/cases/generated/cases/references/Fe10IdeNormalAnalysisSourceModuleReferenceResolveTestGenerated.java
+++ b/analysis/analysis-api-fe10/tests-gen/org/jetbrains/kotlin/analysis/api/fe10/test/cases/generated/cases/references/Fe10IdeNormalAnalysisSourceModuleReferenceResolveTestGenerated.java
@@ -2064,6 +2064,22 @@ public class Fe10IdeNormalAnalysisSourceModuleReferenceResolveTestGenerated exte
         }
     }
 
+    @Nested
+    @TestMetadata("analysis/analysis-api/testData/referenceResolve/kotlinPackage")
+    @TestDataPath("$PROJECT_ROOT")
+    public class KotlinPackage {
+        @Test
+        public void testAllFilesPresentInKotlinPackage() throws Exception {
+            KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("analysis/analysis-api/testData/referenceResolve/kotlinPackage"), Pattern.compile("^([^.]+)\\.kt$"), null, true);
+        }
+
+        @Test
+        @TestMetadata("kotlinxPackage.kt")
+        public void testKotlinxPackage() throws Exception {
+            runTest("analysis/analysis-api/testData/referenceResolve/kotlinPackage/kotlinxPackage.kt");
+        }
+    }
+
     @Nested
     @TestMetadata("analysis/analysis-api/testData/referenceResolve/nestedTypes")
     @TestDataPath("$PROJECT_ROOT")
diff --git a/analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/references/FirIdeDependentAnalysisScriptSourceModuleReferenceResolveTestGenerated.java b/analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/references/FirIdeDependentAnalysisScriptSourceModuleReferenceResolveTestGenerated.java
index ba188e428f7..47cdf03b40c 100644
--- a/analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/references/FirIdeDependentAnalysisScriptSourceModuleReferenceResolveTestGenerated.java
+++ b/analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/references/FirIdeDependentAnalysisScriptSourceModuleReferenceResolveTestGenerated.java
@@ -378,6 +378,16 @@ public class FirIdeDependentAnalysisScriptSourceModuleReferenceResolveTestGenera
         }
     }
 
+    @Nested
+    @TestMetadata("analysis/analysis-api/testData/referenceResolve/kotlinPackage")
+    @TestDataPath("$PROJECT_ROOT")
+    public class KotlinPackage {
+        @Test
+        public void testAllFilesPresentInKotlinPackage() throws Exception {
+            KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("analysis/analysis-api/testData/referenceResolve/kotlinPackage"), Pattern.compile("^(.+)\\.kts$"), null, true);
+        }
+    }
+
     @Nested
     @TestMetadata("analysis/analysis-api/testData/referenceResolve/nestedTypes")
     @TestDataPath("$PROJECT_ROOT")
diff --git a/analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/references/FirIdeDependentAnalysisSourceModuleReferenceResolveTestGenerated.java b/analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/references/FirIdeDependentAnalysisSourceModuleReferenceResolveTestGenerated.java
index e9d0b99c786..24b593caa7c 100644
--- a/analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/references/FirIdeDependentAnalysisSourceModuleReferenceResolveTestGenerated.java
+++ b/analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/references/FirIdeDependentAnalysisSourceModuleReferenceResolveTestGenerated.java
@@ -2064,6 +2064,22 @@ public class FirIdeDependentAnalysisSourceModuleReferenceResolveTestGenerated ex
         }
     }
 
+    @Nested
+    @TestMetadata("analysis/analysis-api/testData/referenceResolve/kotlinPackage")
+    @TestDataPath("$PROJECT_ROOT")
+    public class KotlinPackage {
+        @Test
+        public void testAllFilesPresentInKotlinPackage() throws Exception {
+            KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("analysis/analysis-api/testData/referenceResolve/kotlinPackage"), Pattern.compile("^([^.]+)\\.kt$"), null, true);
+        }
+
+        @Test
+        @TestMetadata("kotlinxPackage.kt")
+        public void testKotlinxPackage() throws Exception {
+            runTest("analysis/analysis-api/testData/referenceResolve/kotlinPackage/kotlinxPackage.kt");
+        }
+    }
+
     @Nested
     @TestMetadata("analysis/analysis-api/testData/referenceResolve/nestedTypes")
     @TestDataPath("$PROJECT_ROOT")
diff --git a/analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/references/FirIdeNormalAnalysisLibrarySourceModuleReferenceResolveTestGenerated.java b/analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/references/FirIdeNormalAnalysisLibrarySourceModuleReferenceResolveTestGenerated.java
index 4a258942e32..8208091c044 100644
--- a/analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/references/FirIdeNormalAnalysisLibrarySourceModuleReferenceResolveTestGenerated.java
+++ b/analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/references/FirIdeNormalAnalysisLibrarySourceModuleReferenceResolveTestGenerated.java
@@ -1908,6 +1908,22 @@ public class FirIdeNormalAnalysisLibrarySourceModuleReferenceResolveTestGenerate
         }
     }
 
+    @Nested
+    @TestMetadata("analysis/analysis-api/testData/referenceResolve/kotlinPackage")
+    @TestDataPath("$PROJECT_ROOT")
+    public class KotlinPackage {
+        @Test
+        public void testAllFilesPresentInKotlinPackage() throws Exception {
+            KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("analysis/analysis-api/testData/referenceResolve/kotlinPackage"), Pattern.compile("^([^.]+)\\.kt$"), null, true, "withErrors");
+        }
+
+        @Test
+        @TestMetadata("kotlinxPackage.kt")
+        public void testKotlinxPackage() throws Exception {
+            runTest("analysis/analysis-api/testData/referenceResolve/kotlinPackage/kotlinxPackage.kt");
+        }
+    }
+
     @Nested
     @TestMetadata("analysis/analysis-api/testData/referenceResolve/nestedTypes")
     @TestDataPath("$PROJECT_ROOT")
diff --git a/analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/references/FirIdeNormalAnalysisScriptSourceModuleReferenceResolveTestGenerated.java b/analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/references/FirIdeNormalAnalysisScriptSourceModuleReferenceResolveTestGenerated.java
index 3b1276b1ce9..2a524302805 100644
--- a/analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/references/FirIdeNormalAnalysisScriptSourceModuleReferenceResolveTestGenerated.java
+++ b/analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/references/FirIdeNormalAnalysisScriptSourceModuleReferenceResolveTestGenerated.java
@@ -378,6 +378,16 @@ public class FirIdeNormalAnalysisScriptSourceModuleReferenceResolveTestGenerated
         }
     }
 
+    @Nested
+    @TestMetadata("analysis/analysis-api/testData/referenceResolve/kotlinPackage")
+    @TestDataPath("$PROJECT_ROOT")
+    public class KotlinPackage {
+        @Test
+        public void testAllFilesPresentInKotlinPackage() throws Exception {
+            KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("analysis/analysis-api/testData/referenceResolve/kotlinPackage"), Pattern.compile("^(.+)\\.kts$"), null, true);
+        }
+    }
+
     @Nested
     @TestMetadata("analysis/analysis-api/testData/referenceResolve/nestedTypes")
     @TestDataPath("$PROJECT_ROOT")
diff --git a/analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/references/FirIdeNormalAnalysisSourceModuleReferenceResolveTestGenerated.java b/analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/references/FirIdeNormalAnalysisSourceModuleReferenceResolveTestGenerated.java
index e06b7e38acb..abf17e693ce 100644
--- a/analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/references/FirIdeNormalAnalysisSourceModuleReferenceResolveTestGenerated.java
+++ b/analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/references/FirIdeNormalAnalysisSourceModuleReferenceResolveTestGenerated.java
@@ -2064,6 +2064,22 @@ public class FirIdeNormalAnalysisSourceModuleReferenceResolveTestGenerated exten
         }
     }
 
+    @Nested
+    @TestMetadata("analysis/analysis-api/testData/referenceResolve/kotlinPackage")
+    @TestDataPath("$PROJECT_ROOT")
+    public class KotlinPackage {
+        @Test
+        public void testAllFilesPresentInKotlinPackage() throws Exception {
+            KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("analysis/analysis-api/testData/referenceResolve/kotlinPackage"), Pattern.compile("^([^.]+)\\.kt$"), null, true);
+        }
+
+        @Test
+        @TestMetadata("kotlinxPackage.kt")
+        public void testKotlinxPackage() throws Exception {
+            runTest("analysis/analysis-api/testData/referenceResolve/kotlinPackage/kotlinxPackage.kt");
+        }
+    }
+
     @Nested
     @TestMetadata("analysis/analysis-api/testData/referenceResolve/nestedTypes")
     @TestDataPath("$PROJECT_ROOT")
diff --git a/analysis/analysis-api-standalone/tests-gen/org/jetbrains/kotlin/analysis/api/standalone/fir/test/cases/generated/cases/references/FirStandaloneNormalAnalysisSourceModuleReferenceResolveTestGenerated.java b/analysis/analysis-api-standalone/tests-gen/org/jetbrains/kotlin/analysis/api/standalone/fir/test/cases/generated/cases/references/FirStandaloneNormalAnalysisSourceModuleReferenceResolveTestGenerated.java
index fce3bdc3489..753ed08e4af 100644
--- a/analysis/analysis-api-standalone/tests-gen/org/jetbrains/kotlin/analysis/api/standalone/fir/test/cases/generated/cases/references/FirStandaloneNormalAnalysisSourceModuleReferenceResolveTestGenerated.java
+++ b/analysis/analysis-api-standalone/tests-gen/org/jetbrains/kotlin/analysis/api/standalone/fir/test/cases/generated/cases/references/FirStandaloneNormalAnalysisSourceModuleReferenceResolveTestGenerated.java
@@ -2064,6 +2064,22 @@ public class FirStandaloneNormalAnalysisSourceModuleReferenceResolveTestGenerate
         }
     }
 
+    @Nested
+    @TestMetadata("analysis/analysis-api/testData/referenceResolve/kotlinPackage")
+    @TestDataPath("$PROJECT_ROOT")
+    public class KotlinPackage {
+        @Test
+        public void testAllFilesPresentInKotlinPackage() throws Exception {
+            KtTestUtil.assertAllTestsPresentByMetadataWithExcluded(this.getClass(), new File("analysis/analysis-api/testData/referenceResolve/kotlinPackage"), Pattern.compile("^([^.]+)\\.kt$"), null, true);
+        }
+
+        @Test
+        @TestMetadata("kotlinxPackage.kt")
+        public void testKotlinxPackage() throws Exception {
+            runTest("analysis/analysis-api/testData/referenceResolve/kotlinPackage/kotlinxPackage.kt");
+        }
+    }
+
     @Nested
     @TestMetadata("analysis/analysis-api/testData/referenceResolve/nestedTypes")
     @TestDataPath("$PROJECT_ROOT")
diff --git a/analysis/analysis-api/testData/referenceResolve/kotlinPackage/kotlinxPackage.kt b/analysis/analysis-api/testData/referenceResolve/kotlinPackage/kotlinxPackage.kt
new file mode 100644
index 00000000000..d952397f172
--- /dev/null
+++ b/analysis/analysis-api/testData/referenceResolve/kotlinPackage/kotlinxPackage.kt
@@ -0,0 +1,12 @@
+// FILE: a.kt
+package kotlinx.pckg
+
+fun foo() {
+    b<caret>ar()
+}
+
+// FILE: b.kt
+package kotlinx.pckg
+
+fun bar() {
+}
diff --git a/analysis/analysis-api/testData/referenceResolve/kotlinPackage/kotlinxPackage.txt b/analysis/analysis-api/testData/referenceResolve/kotlinPackage/kotlinxPackage.txt
new file mode 100644
index 00000000000..586eab540ba
--- /dev/null
+++ b/analysis/analysis-api/testData/referenceResolve/kotlinPackage/kotlinxPackage.txt
@@ -0,0 +1,2 @@
+Resolved to:
+0: (in kotlinx.pckg) fun bar()
diff --git a/analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/util/LLFirKotlinSymbolNamesProvider.kt b/analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/util/LLFirKotlinSymbolNamesProvider.kt
index 50f11ba928f..9d3f4120c44 100644
--- a/analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/util/LLFirKotlinSymbolNamesProvider.kt
+++ b/analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/util/LLFirKotlinSymbolNamesProvider.kt
@@ -53,4 +53,7 @@ internal open class LLFirKotlinSymbolNamesProvider(
 }
 
 private fun FqName.isKotlinPackage(): Boolean = startsWith(StandardNames.BUILT_INS_PACKAGE_NAME)
-private fun String.isKotlinPackage(): Boolean = startsWith(StandardNames.BUILT_INS_PACKAGE_NAME.asString())
+private fun String.isKotlinPackage(): Boolean = startsWith(KOTLIN_PACKAGE_PREFIX)
+
+private const val KOTLIN_PACKAGE_PREFIX = "kotlin."
+