diff --git a/build/common.sh b/build/common.sh
index 9ec643b1d98..67b0a4927d8 100755
--- a/build/common.sh
+++ b/build/common.sh
@@ -178,7 +178,8 @@ function kube::build::verify_prereqs() {
     fi
   fi
 
-  KUBE_ROOT_HASH=$(kube::build::short_hash "${HOSTNAME:-}:${KUBE_ROOT}")
+  KUBE_GIT_BRANCH=$(git symbolic-ref --short -q HEAD 2>/dev/null || true)
+  KUBE_ROOT_HASH=$(kube::build::short_hash "${HOSTNAME:-}:${KUBE_ROOT}:${KUBE_GIT_BRANCH}")
   KUBE_BUILD_IMAGE_TAG_BASE="build-${KUBE_ROOT_HASH}"
   KUBE_BUILD_IMAGE_TAG="${KUBE_BUILD_IMAGE_TAG_BASE}-${KUBE_BUILD_IMAGE_VERSION}"
   KUBE_BUILD_IMAGE="${KUBE_BUILD_IMAGE_REPO}:${KUBE_BUILD_IMAGE_TAG}"