diff --git a/Makefile b/Makefile
index b69bfe1..3a35993 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-DOCKER_IMAGE := mpolden/echoip
+DOCKER_IMAGE ?= mpolden/echoip
 OS := $(shell uname)
 ifeq ($(OS),Linux)
 	TAR_OPTS := --wildcards