diff --git a/compiler/tests-common/tests/org/jetbrains/kotlin/cfg/AbstractDiagnosticsWithModifiedMockJdkTest.java b/compiler/tests-common/tests/org/jetbrains/kotlin/cfg/AbstractDiagnosticsWithModifiedMockJdkTest.kt
similarity index 100%
rename from compiler/tests-common/tests/org/jetbrains/kotlin/cfg/AbstractDiagnosticsWithModifiedMockJdkTest.java
rename to compiler/tests-common/tests/org/jetbrains/kotlin/cfg/AbstractDiagnosticsWithModifiedMockJdkTest.kt
diff --git a/compiler/tests-common/tests/org/jetbrains/kotlin/checkers/AbstractDiagnosticsWithJdk9Test.java b/compiler/tests-common/tests/org/jetbrains/kotlin/checkers/AbstractDiagnosticsWithJdk9Test.kt
similarity index 100%
rename from compiler/tests-common/tests/org/jetbrains/kotlin/checkers/AbstractDiagnosticsWithJdk9Test.java
rename to compiler/tests-common/tests/org/jetbrains/kotlin/checkers/AbstractDiagnosticsWithJdk9Test.kt
diff --git a/compiler/tests-common/tests/org/jetbrains/kotlin/checkers/KotlinMultiFileTestWithJava.java b/compiler/tests-common/tests/org/jetbrains/kotlin/checkers/KotlinMultiFileTestWithJava.kt
similarity index 100%
rename from compiler/tests-common/tests/org/jetbrains/kotlin/checkers/KotlinMultiFileTestWithJava.java
rename to compiler/tests-common/tests/org/jetbrains/kotlin/checkers/KotlinMultiFileTestWithJava.kt