diff --git a/diff-sha.sh b/diff-sha.sh
index d0d645ac..863537c0 100644
--- a/diff-sha.sh
+++ b/diff-sha.sh
@@ -224,7 +224,7 @@ else
       depth=$INPUT_FETCH_DEPTH
       max_depth=$INPUT_MAX_FETCH_DEPTH
 
-      while ! git diff --name-only --ignore-submodules=all "$PREVIOUS_SHA"..."$CURRENT_SHA" 1>/dev/null; do
+      while ! git merge-base "$PREVIOUS_SHA" "$CURRENT_SHA" 1>/dev/null; do
         echo "Fetching $depth commits..."
 
         # shellcheck disable=SC2086