diff --git a/.github/workflows/check-milestone.yml b/.github/workflows/check-milestone.yml
index 02eb82d540aa53726b7c22beb1fcf0bd87725442..b1a51e2245475d03531931cabdfb7f1bbf1e1fe0 100644
--- a/.github/workflows/check-milestone.yml
+++ b/.github/workflows/check-milestone.yml
@@ -8,7 +8,7 @@ on:
 
 jobs:
   milestone-reminder:
-    if: github.event.pull_request.merged == 'true'
+    if: github.event.pull_request.merged == true
     name: Remind to set milestone
     runs-on: ubuntu-22.04
     timeout-minutes: 5