diff --git a/pkg/package.mk b/pkg/package.mk
index e169a1353..6f32c4eb1 100644
--- a/pkg/package.mk
+++ b/pkg/package.mk
@@ -2,10 +2,10 @@
 default: push
 
 ORG?=linuxkit
-HASH?=$(shell git ls-tree HEAD -- ../$(notdir $(CURDIR)) | awk '{print $$3}')
+HASH?=$(shell git ls-tree --full-tree HEAD -- $(CURDIR) | awk '{print $$3}')
 BASE_DEPS=Dockerfile Makefile
 
-DIRTY=$(shell git diff-index --quiet HEAD -- ../$(notdir $(CURDIR)) || echo "-dirty")
+DIRTY=$(shell git diff-index --quiet HEAD -- $(CURDIR) || echo "-dirty")
 TAG=$(ORG)/$(IMAGE):$(HASH)$(DIRTY)
 
 # Get a release tag, if present