diff --git a/.github/workflows/pull_requests.yml b/.github/workflows/pull_requests.yml
index 605dfe785..969eb2e3a 100644
--- a/.github/workflows/pull_requests.yml
+++ b/.github/workflows/pull_requests.yml
@@ -4,7 +4,7 @@ on:
   pull_request:
     branches:
       - master
-      - [0-9.x]+-[0-9.]+
+      - '[0-9.x]+-[0-9.]+'
 
 jobs:
   build: