diff --git a/build-common.sh b/build-common.sh
index fae698d..e2b20f6 100755
--- a/build-common.sh
+++ b/build-common.sh
@@ -1,4 +1,4 @@
-TAG_UNIQUE_ID=`git ls-tree HEAD | sha256sum | cut -c-16`
+TAG_UNIQUE_ID=`(git ls-tree HEAD; git diff-index HEAD) | sha256sum | cut -c-16`
 TAG_NAME="${TARGET_NAME}_${TAG_UNIQUE_ID}"
 OUT_DIR="out_$TARGET_NAME"