diff --git a/lib/sync.sh b/lib/sync.sh
index b2ff277..d24d454 100644
--- a/lib/sync.sh
+++ b/lib/sync.sh
@@ -244,7 +244,7 @@ reverse_sync() {
 
   # 3. Find new human commits (excludes bot commits from forward sync)
   local human_commits
-  human_commits=$(git log "mono-filtered/${mono_branch}..HEAD" \
+  human_commits=$(git log --ancestry-path "mono-filtered/${mono_branch}..HEAD" \
     --oneline --invert-grep --grep="^${BOT_TRAILER}:" 2>/dev/null || echo "")
 
   if [ -z "$human_commits" ]; then