diff --git a/.github/workflows/docker-build.yml b/.github/workflows/docker-build.yml
index f686de2..4a33fcb 100644
--- a/.github/workflows/docker-build.yml
+++ b/.github/workflows/docker-build.yml
@@ -27,4 +27,5 @@ jobs:
         with:
           context: .
           push: true
-          tags: ghcr.io/${{ github.repository_owner }}/kokoro-fastapi:fix-timestamps
+          tags: ghcr.io/${{ github.repository_owner.toLower() }}/kokoro-fastapi:fix-timestamps
+