diff --git a/dzgui.sh b/dzgui.sh
index b52012d..7850a4f 100755
--- a/dzgui.sh
+++ b/dzgui.sh
@@ -536,7 +536,7 @@ local_latlon(){
     echo "$res" > "$coords_file"
 }
 
-lock
+lock(){
     [[ ! -f $lock_file ]] && touch $lock_file
     local pid=$(cat $lock_file)
     ps -p $pid -o pid= >/dev/null 2>&1