diff --git a/Makefile b/Makefile
index d779c30718..7240237c27 100644
--- a/Makefile
+++ b/Makefile
@@ -13,7 +13,7 @@ $(shell rm -f .screen)
 MAKEFLAGS += -B
 
 SLAVE_BASE_TAG = $(shell shasum sonic-slave/Dockerfile | awk '{print substr($$1,0,11);}')
-SLAVE_TAG = $(shell shasum sonic-slave/Dockerfile.user | awk '{print substr($$1,0,11);}')
+SLAVE_TAG = $(shell cat sonic-slave/Dockerfile.user sonic-slave/Dockerfile | shasum | awk '{print substr($$1,0,11);}')
 SLAVE_BASE_IMAGE = sonic-slave-base
 SLAVE_IMAGE = sonic-slave-$(USER)