diff --git a/action.yml b/action.yml
index 9828003..e78c2c9 100644
--- a/action.yml
+++ b/action.yml
@@ -36,4 +36,4 @@ runs:
         MAX_WAIT_MINUTES: ${{ inputs.max_wait_minutes }}
         ORG_NAME: ${{ inputs.organization }}
         REPO_NAME: ${{ inputs.repository }}
-        REF: ${{ inputs.ref }
+        REF: ${{ inputs.ref || github.ref }}