diff --git a/core/descriptors/src/org/jetbrains/kotlin/descriptors/Visibilities.java b/core/descriptors/src/org/jetbrains/kotlin/descriptors/Visibilities.java
index 39c70c286dc..f9b8e02190e 100644
--- a/core/descriptors/src/org/jetbrains/kotlin/descriptors/Visibilities.java
+++ b/core/descriptors/src/org/jetbrains/kotlin/descriptors/Visibilities.java
@@ -214,7 +214,7 @@ public class Visibilities {
             @NotNull DeclarationDescriptorWithVisibility what,
             @NotNull DeclarationDescriptor from
     ) {
-        DeclarationDescriptorWithVisibility parent = what;
+        DeclarationDescriptorWithVisibility parent = (DeclarationDescriptorWithVisibility) what.getOriginal();
         while (parent != null && parent.getVisibility() != LOCAL) {
             if (!parent.getVisibility().isVisible(receiver, parent, from)) {
                 return parent;
diff --git a/idea/idea-completion/testData/basic/common/visibility/KT9970.kt b/idea/idea-completion/testData/basic/common/visibility/KT9970.kt
new file mode 100644
index 00000000000..dec05fcc00f
--- /dev/null
+++ b/idea/idea-completion/testData/basic/common/visibility/KT9970.kt
@@ -0,0 +1,7 @@
+class Z<T> {
+    fun f(): Z<T> = ext<caret>
+}
+
+private fun <T> Z<T>.extFun() = Z<T>()
+
+// EXIST: "extFun"
diff --git a/idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/JSBasicCompletionTestGenerated.java b/idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/JSBasicCompletionTestGenerated.java
index e9dd1c08340..40443634b98 100644
--- a/idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/JSBasicCompletionTestGenerated.java
+++ b/idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/JSBasicCompletionTestGenerated.java
@@ -2352,6 +2352,12 @@ public class JSBasicCompletionTestGenerated extends AbstractJSBasicCompletionTes
                 KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("idea/idea-completion/testData/basic/common/visibility"), Pattern.compile("^(.+)\\.kt$"), true);
             }
 
+            @TestMetadata("KT9970.kt")
+            public void testKT9970() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("idea/idea-completion/testData/basic/common/visibility/KT9970.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("VisibilityClassMembersFromExternal.kt")
             public void testVisibilityClassMembersFromExternal() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("idea/idea-completion/testData/basic/common/visibility/VisibilityClassMembersFromExternal.kt");
diff --git a/idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/JvmBasicCompletionTestGenerated.java b/idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/JvmBasicCompletionTestGenerated.java
index c83920ad9a9..3834172832a 100644
--- a/idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/JvmBasicCompletionTestGenerated.java
+++ b/idea/idea-completion/tests/org/jetbrains/kotlin/idea/completion/test/JvmBasicCompletionTestGenerated.java
@@ -2352,6 +2352,12 @@ public class JvmBasicCompletionTestGenerated extends AbstractJvmBasicCompletionT
                 KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("idea/idea-completion/testData/basic/common/visibility"), Pattern.compile("^(.+)\\.kt$"), true);
             }
 
+            @TestMetadata("KT9970.kt")
+            public void testKT9970() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("idea/idea-completion/testData/basic/common/visibility/KT9970.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("VisibilityClassMembersFromExternal.kt")
             public void testVisibilityClassMembersFromExternal() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("idea/idea-completion/testData/basic/common/visibility/VisibilityClassMembersFromExternal.kt");