diff --git a/Makefile b/Makefile
index 479f428..c3ea0bb 100644
--- a/Makefile
+++ b/Makefile
@@ -104,7 +104,7 @@ init-dirs:
 
 build/openmaptiles.tm2source/data.yml: init-dirs
 	mkdir -p build/openmaptiles.tm2source
-	$(DOCKER_COMPOSE) run $(DC_OPTS) openmaptiles-tools generate-tm2source openmaptiles.yaml --host="postgres" --port=5432 --database="openmaptiles" --user="$DC_USER" --password="$DC_PASSWORD" > $@
+	$(DOCKER_COMPOSE) run $(DC_OPTS) openmaptiles-tools generate-tm2source openmaptiles.yaml --host="postgres" --port=5432 --database="openmaptiles" --user="$(DC_USER)" --password="$(DC_PASSWORD)" > $@
 
 build/mapping.yaml: init-dirs
 	$(DOCKER_COMPOSE) run $(DC_OPTS) openmaptiles-tools generate-imposm3 openmaptiles.yaml > $@