diff --git a/compiler/testData/diagnostics/tests/imports/ImportFromCompanionObject.kt b/compiler/testData/diagnostics/tests/imports/ImportFromCompanionObject.kt
index 5aa918ae0b8..b696068686b 100644
--- a/compiler/testData/diagnostics/tests/imports/ImportFromCompanionObject.kt
+++ b/compiler/testData/diagnostics/tests/imports/ImportFromCompanionObject.kt
@@ -1,4 +1,4 @@
-// FILE: a.Kt
+// FILE: a.kt
 package a
 
 class C1 {
diff --git a/compiler/testData/diagnostics/tests/override/clashesOnInheritance/flexibleReturnTypeIn.kt b/compiler/testData/diagnostics/tests/override/clashesOnInheritance/flexibleReturnTypeIn.kt
index bdb7e6e4220..0c0e63b2220 100644
--- a/compiler/testData/diagnostics/tests/override/clashesOnInheritance/flexibleReturnTypeIn.kt
+++ b/compiler/testData/diagnostics/tests/override/clashesOnInheritance/flexibleReturnTypeIn.kt
@@ -1,4 +1,4 @@
-// FILE: InOut.k
+// FILE: InOut.kt
 interface In<in T>
 
 // FILE: J1.java