diff --git a/compiler/fir/resolve/testData/resolve/problems/extensionLambdaInDefaultArgument.kt b/compiler/fir/resolve/testData/resolve/problems/extensionLambdaInDefaultArgument.kt
new file mode 100644
index 00000000000..8458adad7b2
--- /dev/null
+++ b/compiler/fir/resolve/testData/resolve/problems/extensionLambdaInDefaultArgument.kt
@@ -0,0 +1,5 @@
+fun test(
+    val f: String.() -> Int = { <!UNRESOLVED_REFERENCE!>length<!> }
+): Int {
+    return "".f()
+}
\ No newline at end of file
diff --git a/compiler/fir/resolve/testData/resolve/problems/extensionLambdaInDefaultArgument.txt b/compiler/fir/resolve/testData/resolve/problems/extensionLambdaInDefaultArgument.txt
new file mode 100644
index 00000000000..2aea57f213b
--- /dev/null
+++ b/compiler/fir/resolve/testData/resolve/problems/extensionLambdaInDefaultArgument.txt
@@ -0,0 +1,7 @@
+FILE: extensionLambdaInDefaultArgument.kt
+    public final fun test(f: R|kotlin/String.() -> kotlin/Int| = fun R|kotlin/String|.<anonymous>(): R|ERROR CLASS: Unresolved name: length| {
+        ^ <Unresolved name: length>#
+    }
+    ): R|kotlin/Int| {
+        ^test R|<local>/f|.R|FakeOverride<kotlin/Function1.invoke: R|kotlin/Int|>|(String())
+    }
diff --git a/compiler/fir/resolve/tests/org/jetbrains/kotlin/fir/FirDiagnosticsTestGenerated.java b/compiler/fir/resolve/tests/org/jetbrains/kotlin/fir/FirDiagnosticsTestGenerated.java
index b892e3d3692..4a9f985089e 100644
--- a/compiler/fir/resolve/tests/org/jetbrains/kotlin/fir/FirDiagnosticsTestGenerated.java
+++ b/compiler/fir/resolve/tests/org/jetbrains/kotlin/fir/FirDiagnosticsTestGenerated.java
@@ -1299,6 +1299,11 @@ public class FirDiagnosticsTestGenerated extends AbstractFirDiagnosticsTest {
             runTest("compiler/fir/resolve/testData/resolve/problems/definitelyNotNullAndOriginalType.kt");
         }
 
+        @TestMetadata("extensionLambdaInDefaultArgument.kt")
+        public void testExtensionLambdaInDefaultArgument() throws Exception {
+            runTest("compiler/fir/resolve/testData/resolve/problems/extensionLambdaInDefaultArgument.kt");
+        }
+
         @TestMetadata("javaAccessorConversion.kt")
         public void testJavaAccessorConversion() throws Exception {
             runTest("compiler/fir/resolve/testData/resolve/problems/javaAccessorConversion.kt");
diff --git a/compiler/fir/resolve/tests/org/jetbrains/kotlin/fir/FirDiagnosticsWithLightTreeTestGenerated.java b/compiler/fir/resolve/tests/org/jetbrains/kotlin/fir/FirDiagnosticsWithLightTreeTestGenerated.java
index 5ff29d97353..856e697c43a 100644
--- a/compiler/fir/resolve/tests/org/jetbrains/kotlin/fir/FirDiagnosticsWithLightTreeTestGenerated.java
+++ b/compiler/fir/resolve/tests/org/jetbrains/kotlin/fir/FirDiagnosticsWithLightTreeTestGenerated.java
@@ -1299,6 +1299,11 @@ public class FirDiagnosticsWithLightTreeTestGenerated extends AbstractFirDiagnos
             runTest("compiler/fir/resolve/testData/resolve/problems/definitelyNotNullAndOriginalType.kt");
         }
 
+        @TestMetadata("extensionLambdaInDefaultArgument.kt")
+        public void testExtensionLambdaInDefaultArgument() throws Exception {
+            runTest("compiler/fir/resolve/testData/resolve/problems/extensionLambdaInDefaultArgument.kt");
+        }
+
         @TestMetadata("javaAccessorConversion.kt")
         public void testJavaAccessorConversion() throws Exception {
             runTest("compiler/fir/resolve/testData/resolve/problems/javaAccessorConversion.kt");