diff --git a/proto/compiler/google/src/google/protobuf/compiler/kotlin/Makefile b/proto/compiler/google/src/google/protobuf/compiler/kotlin/Makefile
index 6a1fcdb6340..235c568c701 100644
--- a/proto/compiler/google/src/google/protobuf/compiler/kotlin/Makefile
+++ b/proto/compiler/google/src/google/protobuf/compiler/kotlin/Makefile
@@ -35,7 +35,8 @@ $(JAVAOUT):
 clean:
 	rm -rf $(BINDIR)
 	rm $(EXE)
-	rm -rf $(KTPROJECT)
+	rm -rf $(KTOUT)
+	rm -rf $(JAVAOUT)/java_msg
 
 $(KTOUT)/%.kt: $(TESTDIR)/%.proto $(EXE)
 	./protoc --kotlin_out=$(KTOUT) $<