diff --git a/Makefile b/Makefile
old mode 100644
new mode 100755
index 43e2d26..bf8f8db
--- a/Makefile
+++ b/Makefile
@@ -1,9 +1,9 @@
 all: build
 
 ENVVAR = GOOS=linux GOARCH=amd64
-TAG = v0.1.8
+TAG ?= v0.1.8
 APP_NAME = calico-accountant
-REPO = andreas-p
+REPO ?= andreas-p
 IMAGE_TAG = $(REPO)/$(APP_NAME):$(TAG)
 
 clean: