diff --git a/action.yml b/action.yml
index daa8c9a..8efa331 100644
--- a/action.yml
+++ b/action.yml
@@ -25,7 +25,7 @@ inputs:
   PR_LIFETIME:
     description: Expiration period for PRs in epochs
     required: false
-    default: '0'
+    default: 'PR_LIFETIME'
   MASTER_LIFETIME:
     description: Expiration period for master branch in epochs
     required: false