diff --git a/.github/workflows/multi-build.yaml b/.github/workflows/multi-build.yaml
index 25aeb0d..8c35ba6 100644
--- a/.github/workflows/multi-build.yaml
+++ b/.github/workflows/multi-build.yaml
@@ -283,7 +283,7 @@ jobs:
         run: |
           images=""
           for tag in ${TAGS}; do
-            images+="${tag}@${DIGEST_0}"
+            images+="${tag}@${DIGEST_0} "
           done
           cosign sign --recursive --yes --key env://COSIGN_PRIVATE_KEY ${images}
         env: