diff --git a/.github/workflows/pr-modification.yaml b/.github/workflows/pr-modification.yaml
index 37f082f38914..205c3d805d5c 100644
--- a/.github/workflows/pr-modification.yaml
+++ b/.github/workflows/pr-modification.yaml
@@ -13,7 +13,7 @@ permissions:
 jobs:
   find-prs:
     env:
-      LOOK_BACK: ${{ github.event.inputs.lookback }} || "10 minutes"
+      LOOK_BACK: ${{ github.event.inputs.lookback || '10 minutes' }}
       GH_TOKEN: ${{ github.token }}
     runs-on: ubuntu-24.04
     outputs: