diff --git a/.circleci/config.yml b/.circleci/config.yml
index 93a4382..2be858e 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -96,7 +96,8 @@ jobs:
           name: Build
           command: |
             mkdir images
-            echo 'export TAG="$CIRCLE_SHA1"' >> images/env.sh
+            SHA1=$(echo $CIRCLE_SHA1 | cut -c1-7)
+            echo 'export TAG="$SHA1"' >> images/env.sh
             source images/env.sh
             docker build --rm --force-rm -t isce/isce2:$TAG -f docker/Dockerfile .
             cd images