diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index c14ae40..9b1a87c 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -26,6 +26,7 @@ jobs:
           cmd: sign
           source: ${{ steps.web-ext-build.outputs.target }}
           channel: unlisted
+          apiUrlPrefix: https://addons.thunderbird.net/api/v4
           apiKey: ${{ secrets.AMO_SIGN_KEY }}
           apiSecret: ${{ secrets.AMO_SIGN_SECRET }}
           timeout: 900000