diff --git a/auto/Makefile b/auto/Makefile
index fa3218d..5b855a2 100644
--- a/auto/Makefile
+++ b/auto/Makefile
@@ -114,7 +114,7 @@ ifeq ($(patsubst Darwin%,Darwin,$(SYSTEM)), Darwin)
 	xargs -J % cp % $(EXT)
 else
 	find $(CORE) -maxdepth 1 -type f | grep -v VERSION | grep -v "~" | \
-	xargs cp --target-directory=$(EXT)
+	xargs -I % -n 1 cp % $(EXT)
 endif
 	touch $@