diff --git a/Makefile b/Makefile
index ff5bf1092..c44314969 100644
--- a/Makefile
+++ b/Makefile
@@ -33,7 +33,7 @@ IMAGE_FILE := evcc_$(TAG_NAME).img
 PACKAGES = ./release
 
 # asn1-patch
-GOROOT := $(shell go env GOROOT)
+GOROOT = $(shell go env GOROOT)
 CURRDIR := $(shell pwd)
 
 default:: ui build