diff --git a/action.yml b/action.yml
index ab49f51..917896f 100644
--- a/action.yml
+++ b/action.yml
@@ -12,7 +12,7 @@ runs:
         ${{ github.action_path }}/entrypoint.sh
       env:
         INPUT_HEAD_REF: ${{ github.head_ref }}
-        INPUT_REF: ${{ github.ref }}
+        INPUT_BASE_REF: ${{ github.base_ref }}
 
 branding:
   icon: "activity"
diff --git a/entrypoint.sh b/entrypoint.sh
index 3204093..09a5e77 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -3,6 +3,4 @@
 # x would be for showing the commands before they are executed
 set -eux
 
-echo $INPUT_HEAD_REF
-echo $INPUT_REF
-git log --oneline --decorate $INPUT_HEAD_REF..$INPUT_REF --format=%B -n 1
+git log --oneline --decorate $INPUT_BASE_REF..$INPUT_HEAD_REF --format=%B -n 1