diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index 938efcd..d605cb2 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -35,6 +35,7 @@ jobs:
   live-iso:
     name: Live ISO
     runs-on: ubuntu-latest
+    if: github.ref == 'refs/heads/master'
     steps:
     - uses: actions/checkout@v1