diff --git a/sync-from-upstream b/sync-from-upstream
index 56beeb6..ab4113c 100755
--- a/sync-from-upstream
+++ b/sync-from-upstream
@@ -4,6 +4,12 @@ if [ -z $1 ]; then
   HOWMANY="-1"
 fi
 
+BRANCH=$(git branch --show-current)
+if [[ ! "${BRANCH}" =~ "lh" ]]; then
+  echo "Not a lookahead branch."
+  exit 1
+fi
+
 echo "Fetching from upstream"
 git fetch https://gitlab.com/redhat/centos-stream/release-engineering/pungi-centos.git centos-9-stream
 echo "Formatting patch and applying..."