diff --git a/Makefile b/Makefile
index 5c8bb4f..2a0d667 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 VERSION:=$(shell git describe --always)
-TARGET_ENV=dev
+TARGET_ENV?=dev
 
 build: dist/personal-measure-api.tar.gz dist/personal-measure-web.tar.gz