diff --git a/scripts/combo-layer-hook-default.sh b/scripts/combo-layer-hook-default.sh
index e535d5f4cc..8b148aca07 100755
--- a/scripts/combo-layer-hook-default.sh
+++ b/scripts/combo-layer-hook-default.sh
@@ -10,4 +10,4 @@ rev=$2
 reponame=$3
 
 sed -i -e "s#^Subject: \[PATCH\] \(.*\)#Subject: \[PATCH\] $reponame: \1#" $patchfile
-sed -i -e "0,/^Signed-off-by:/s#\(Signed-off-by:.*\)#\($reponame rev: $rev\)\n\n\1#" $patchfile
+sed -i -e "0,/^Signed-off-by:/s#\(^Signed-off-by:.*\)#\($reponame rev: $rev\)\n\n\1#" $patchfile