diff --git a/j2k/newSrc/org/jetbrains/kotlin/j2k/NewJavaToKotlinConverter.kt b/j2k/newSrc/org/jetbrains/kotlin/j2k/NewJavaToKotlinConverter.kt
index b09c3059d7b..3935720fbd5 100644
--- a/j2k/newSrc/org/jetbrains/kotlin/j2k/NewJavaToKotlinConverter.kt
+++ b/j2k/newSrc/org/jetbrains/kotlin/j2k/NewJavaToKotlinConverter.kt
@@ -27,7 +27,7 @@ class NewJavaToKotlinConverter(
         private val settings: ConverterSettings
 ) {
 
-    fun filesToKotlin(files: List<PsiJavaFile>, progressIndicator: ProgressIndicator = EmptyProgressIndicator()) {
-
+    fun filesToKotlin(files: List<PsiJavaFile>, progressIndicator: ProgressIndicator = EmptyProgressIndicator()): Nothing {
+        TODO("Output generation")
     }
 }
\ No newline at end of file
diff --git a/j2k/tests/org/jetbrains/kotlin/j2k/AbstractNewJavaToKotlinConverterSingleFileTest.kt b/j2k/tests/org/jetbrains/kotlin/j2k/AbstractNewJavaToKotlinConverterSingleFileTest.kt
index 8f246da3efe..fd4dd1a61fa 100644
--- a/j2k/tests/org/jetbrains/kotlin/j2k/AbstractNewJavaToKotlinConverterSingleFileTest.kt
+++ b/j2k/tests/org/jetbrains/kotlin/j2k/AbstractNewJavaToKotlinConverterSingleFileTest.kt
@@ -23,6 +23,5 @@ abstract class AbstractNewJavaToKotlinConverterSingleFileTest : AbstractJavaToKo
     override fun fileToKotlin(text: String, settings: ConverterSettings, project: Project): String {
         val file = createJavaFile(text)
         NewJavaToKotlinConverter(project, settings).filesToKotlin(listOf(file))
-        TODO("Output generation")
     }
 }
\ No newline at end of file