diff --git a/.github/workflows/bc.yml b/.github/workflows/bc.yml
index 7fec32c4..5970206c 100644
--- a/.github/workflows/bc.yml
+++ b/.github/workflows/bc.yml
@@ -1,6 +1,15 @@
 on:
-  - pull_request
-  - push
+  pull_request:
+    paths:
+      - 'src/**'
+      - '.github/workflows/bc.yml'
+      - 'composer.json'
+  push:
+    branches: ['master']
+    paths:
+      - 'src/**'
+      - '.github/workflows/bc.yml'
+      - 'composer.json'
 
 name: backwards compatibility