diff --git a/.github/workflows/build-nightly.yml b/.github/workflows/build-nightly.yml
index aa1f916afe3..1790d5c84fa 100644
--- a/.github/workflows/build-nightly.yml
+++ b/.github/workflows/build-nightly.yml
@@ -11,6 +11,7 @@ permissions:
 jobs:
   compute-suffix:
     runs-on: ubuntu-latest
+    if: github.repository == 'mastodon/mastodon'
     steps:
       - id: version_vars
         env:
diff --git a/.github/workflows/crowdin-download.yml b/.github/workflows/crowdin-download.yml
index e5385808def..8268788be42 100644
--- a/.github/workflows/crowdin-download.yml
+++ b/.github/workflows/crowdin-download.yml
@@ -11,6 +11,7 @@ permissions:
 jobs:
   download-translations:
     runs-on: ubuntu-latest
+    if: github.repository == 'mastodon/mastodon'
 
     steps:
       - name: Checkout