diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 3477d864a56ed..2fa03286350ae 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -43,7 +43,7 @@ jobs:
           context: ./contrib/containers/ci
           file: ./contrib/containers/ci/Dockerfile
           push: true
-          tags: ghcr.io/${{ github.repository }}/builder:${{ steps.prepare.outputs.image-tag }}
+          tags: ghcr.io/${{ github.repository | lower }}/builder:${{ steps.prepare.outputs.image-tag }}
 
   build-depends:
     name: Build Dependencies