diff --git a/hack/tfw.sh b/hack/tfw.sh
index d1dd728..a6ca836 100755
--- a/hack/tfw.sh
+++ b/hack/tfw.sh
@@ -23,8 +23,8 @@ build_baseimage()
 {
     [ ! -d "$BASEIMAGE_PATH" ] && return || :
     cd $BASEIMAGE_PATH
-    docker build -t "${BASEIMAGE_NAME}:$(baseimage_releasename)" \
-                 -t "${BASEIMAGE_NAME}:latest"                   \
+    docker build -t "${BASEIMAGE_NAME}:${TFWTAG:-$(baseimage_releasename)}" \
+                 -t "${BASEIMAGE_NAME}:latest"                              \
                  .
 }