diff --git a/compiler/testData/codegen/scriptCustom/fib.lang.kt b/compiler/testData/codegen/scriptCustom/fib.lang.kts
similarity index 100%
rename from compiler/testData/codegen/scriptCustom/fib.lang.kt
rename to compiler/testData/codegen/scriptCustom/fib.lang.kts
diff --git a/compiler/testData/codegen/scriptCustom/fibwp.lang.kt b/compiler/testData/codegen/scriptCustom/fibwp.lang.kts
similarity index 100%
rename from compiler/testData/codegen/scriptCustom/fibwp.lang.kt
rename to compiler/testData/codegen/scriptCustom/fibwp.lang.kts
diff --git a/compiler/testData/codegen/scriptCustom/methodWithClosure.lang.kt b/compiler/testData/codegen/scriptCustom/methodWithClosure.lang.kts
similarity index 100%
rename from compiler/testData/codegen/scriptCustom/methodWithClosure.lang.kt
rename to compiler/testData/codegen/scriptCustom/methodWithClosure.lang.kts
diff --git a/compiler/tests/org/jetbrains/kotlin/codegen/ScriptGenTest.kt b/compiler/tests/org/jetbrains/kotlin/codegen/ScriptGenTest.kt
index 29031a9741c..142380f3c8d 100644
--- a/compiler/tests/org/jetbrains/kotlin/codegen/ScriptGenTest.kt
+++ b/compiler/tests/org/jetbrains/kotlin/codegen/ScriptGenTest.kt
@@ -50,7 +50,7 @@ class ScriptGenTest : CodegenTestCase() {
     }
 
     fun testLanguage() {
-        setUpEnvironment("scriptCustom/fib.lang.kt")
+        setUpEnvironment("scriptCustom/fib.lang.kts")
 
         val aClass = generateClass("Fib_lang")
         val constructor = aClass.getConstructor(Integer.TYPE)
@@ -61,7 +61,7 @@ class ScriptGenTest : CodegenTestCase() {
     }
 
     fun testLanguageWithPackage() {
-        setUpEnvironment("scriptCustom/fibwp.lang.kt")
+        setUpEnvironment("scriptCustom/fibwp.lang.kts")
 
         val aClass = generateClass("test.Fibwp_lang")
         val constructor = aClass.getConstructor(Integer.TYPE)
@@ -72,7 +72,7 @@ class ScriptGenTest : CodegenTestCase() {
     }
 
     fun testDependentScripts() {
-        setUpEnvironment(listOf("scriptCustom/fibwp.lang.kt", "scriptCustom/fibwprunner.kts"))
+        setUpEnvironment(listOf("scriptCustom/fibwp.lang.kts", "scriptCustom/fibwprunner.kts"))
 
         val aClass = generateClass("Fibwprunner")
         val constructor = aClass.getConstructor()
@@ -88,7 +88,7 @@ class ScriptGenTest : CodegenTestCase() {
     }
 
     fun testScriptWhereMethodHasClosure() {
-        setUpEnvironment("scriptCustom/methodWithClosure.lang.kt")
+        setUpEnvironment("scriptCustom/methodWithClosure.lang.kts")
 
         val aClass = generateClass("MethodWithClosure_lang")
         val constructor = aClass.getConstructor(Integer.TYPE)
@@ -127,6 +127,6 @@ class ScriptGenTest : CodegenTestCase() {
 }
 
 @ScriptTemplateDefinition(
-        scriptFilePattern =".*\\.lang\\.kt",
+        scriptFilePattern =".*\\.lang\\.kts",
         resolver = TestKotlinScriptDependenciesResolver::class)
 abstract class ScriptWithIntParam(val num: Int)
\ No newline at end of file