diff --git a/.github/workflows/pyinstaller.yml b/.github/workflows/pyinstaller.yml
index 2b6cc65..8d4ff85 100644
--- a/.github/workflows/pyinstaller.yml
+++ b/.github/workflows/pyinstaller.yml
@@ -2,6 +2,14 @@
 
 name: pyinstaller
 
+on:
+  push:
+    branches:
+      - master # $default-branch only works in Workflows templates, not in Workflows, see https://stackoverflow.com/questions/64781462/github-actions-default-branch-variable
+  pull_request:
+    branches:
+      - master
+
 jobs:
   pyinstaller-build:
     runs-on: [ ubuntu-latest, windows-latest, macos-latest ]