diff --git a/Makefile b/Makefile
index 90495e1..f63405f 100644
--- a/Makefile
+++ b/Makefile
@@ -20,6 +20,6 @@ $(TARGET): $(I6S)
 	$(INFORM7) $(ARGS) $<
 
 clean:
-	rm $(SRCDIR)/*.i6
-	rm *.gblorb
-	rm *.ulx
+	- rm $(SRCDIR)/*.i6
+	- rm *.gblorb
+	- rm *.ulx