diff --git a/Makefile b/Makefile
index 9c165cd..f2799a9 100644
--- a/Makefile
+++ b/Makefile
@@ -15,7 +15,7 @@ prod: build tag push
 	  -X POST "$(COOLIFY_PROD_DEPLOY_WEBHOOK)"
 
 build:
-	docker build --build-arg GIT_REV=$(git rev-parse --short HEAD) -t debshots-$(TAG) .
+	docker build --build-arg GIT_REV=$(shell git rev-parse --short HEAD) -t debshots-$(TAG) .
 
 tag:
 	docker tag debshots-$(TAG) $(REGISTRY)/debshots:$(TAG)