diff --git a/lib/atc/Makefile.g++ b/lib/atc/Makefile.g++
index 66361ebc5d..5b12e403ab 100644
--- a/lib/atc/Makefile.g++
+++ b/lib/atc/Makefile.g++
@@ -131,4 +131,4 @@ DEPENDS = $(OBJ:.o=.d)
 # ------ CLEAN ------
 
 clean:
-	rm *.o *.d *~ $(LIB)
+	-rm *.o *.d *~ $(LIB)