diff --git a/monitor.c b/monitor.c
index 42ae1546db..b375f102b7 100644
--- a/monitor.c
+++ b/monitor.c
@@ -3918,7 +3918,7 @@ static void monitor_find_completion(const char *cmdline)
         }
         str = args[nb_args - 1];
         if (*ptype == '-' && ptype[1] != '\0') {
-            ptype += 2;
+            ptype = next_arg_type(ptype);
         }
         switch(*ptype) {
         case 'F':