diff --git a/docker.mk b/docker.mk
index 28144ff..9dc7330 100644
--- a/docker.mk
+++ b/docker.mk
@@ -1,4 +1,6 @@
 MANDATORY-compose = DEPLOY_HOSTS DEPLOY_TYPE TAG
+MANDATORY-swarm = DEPLOY_HOSTS DEPLOY_TYPE TAG
+
 pull-compose:
 	@- echo "\n### pulling image(s)"
 	@- $(foreach host,$(DEPLOY_HOSTS), \