diff --git a/Makefile b/Makefile
index 0424c77..b005868 100755
--- a/Makefile
+++ b/Makefile
@@ -5,9 +5,7 @@ OS_PERMS=sudo
 
 
 all: 
-	@if [ ! -a deps/rootfs.tar.gz ]; then \
-		$(MAKE) build_filesystem; \
-	fi;
+	test -s deps/rootfs.tar.gz || $(MAKE) build_filesystem
 	$(MAKE) docker_build_web
 
 build_filesystem: