diff --git a/lib/resource-1.0/Makefile b/lib/resource-1.0/Makefile
index 33e33764b..a7e356b0a 100644
--- a/lib/resource-1.0/Makefile
+++ b/lib/resource-1.0/Makefile
@@ -56,5 +56,5 @@ gfdoc:
 	mv ../prelude/*.html doc/gfdoc
 
 clean:
-	rm */*.gfc */*.gfr */*.gf~
+	-rm */*.gfc */*.gfr */*.gf~