diff --git a/compose.mk b/compose.mk
index fc68b97..36e23a9 100644
--- a/compose.mk
+++ b/compose.mk
@@ -1,5 +1,5 @@
 ifdef DOCKER_LOGIN
-MANDATORY = $(MANDATORY) DOCKER_USER DOCKER_PASS DOCKER_REGISTRY
+MANDATORY = $(shell printenv MANDATORY) DOCKER_USER DOCKER_PASS DOCKER_REGISTRY
 endif
 
 ifndef DOCKER_LOGIN