diff --git a/.github/workflows/build-push.yml b/.github/workflows/build-push.yml
index 4ef27c12..33be28eb 100644
--- a/.github/workflows/build-push.yml
+++ b/.github/workflows/build-push.yml
@@ -181,7 +181,7 @@ jobs:
             eicweb/${{ matrix.BUILD_IMAGE }}:test
             ghcr.io/eic/${{ matrix.BUILD_IMAGE }}:test
           build-args: |
-            DOCKER_REGISTRY=${{ env.GH_REGISTRY }}/${{ env.GH_REGISTRY_USER }}
+            DOCKER_REGISTRY=${{ env.GH_REGISTRY }}/${{ env.GH_REGISTRY_USER }}/
             BASE_IMAGE=${{ matrix.BASE_IMAGE }}
             BUILD_IMAGE=${{ matrix.BUILD_IMAGE }}
             SPACK_ORGREPO=${{ steps.spack.outputs.orgrepo }}