diff --git a/push-nix-cache/action.yaml b/push-nix-cache/action.yaml
index bd9edac..bc79e91 100644
--- a/push-nix-cache/action.yaml
+++ b/push-nix-cache/action.yaml
@@ -26,7 +26,8 @@ runs:
       run: |
         echo "${NIX_SIGNING_KEY}" > /tmp/nix-key
         nix store sign -k /tmp/nix-key --recursive "${{ inputs.store-path }}"
-        nix copy \
-          --to "s3://${{ inputs.s3-bucket }}?endpoint=${{ inputs.s3-endpoint }}" \
-          "${{ inputs.store-path }}"
         rm /tmp/nix-key
+        nix copy --to "file:///tmp/nix-cache" "${{ inputs.store-path }}"
+        aws s3 sync /tmp/nix-cache \
+          "s3://${{ inputs.s3-bucket }}" \
+          --endpoint-url "${{ inputs.s3-endpoint }}"