diff --git a/.gitea/workflows/abstract-machine-build.yml b/.gitea/workflows/abstract-machine-build.yml
index 5b4d0fd..3a4547c 100644
--- a/.gitea/workflows/abstract-machine-build.yml
+++ b/.gitea/workflows/abstract-machine-build.yml
@@ -1,5 +1,11 @@
 name: Build abstract machine with nix
-on: [push]
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
 
 jobs:
   build-abstract-machine: