diff --git a/.github/workflows/cron-unstable-build.yaml b/.github/workflows/cron-unstable-build.yaml
index 1af1388889d..83fdad6ffff 100644
--- a/.github/workflows/cron-unstable-build.yaml
+++ b/.github/workflows/cron-unstable-build.yaml
@@ -22,6 +22,7 @@ concurrency: unstable-build-release
 jobs:
   # This job provides this metadata for the other jobs to use.
   unstable-build-get-meta:
+    if: github.repository_owner == 'fluent'
     name: Get metadata to add to build
     runs-on: ubuntu-latest
     environment: unstable
@@ -96,6 +97,7 @@ jobs:
       token: ${{ secrets.GITHUB_TOKEN }}
 
   unstable-build-generate-matrix:
+    if: github.repository_owner == 'fluent'
     name: unstable build matrix
     needs:
       - unstable-build-get-meta
@@ -156,6 +158,7 @@ jobs:
   # We already detain all artefacts as build output so just capture for an unstable release.
   # We make all of these on a separate repo to prevent notification spam.
   unstable-release:
+    if: github.repository_owner == 'fluent'
     runs-on: ubuntu-latest
     needs:
       - unstable-build-get-meta