diff --git a/monitor.c b/monitor.c
index cc31c15f0e..62d9de0680 100644
--- a/monitor.c
+++ b/monitor.c
@@ -2330,8 +2330,8 @@ static void monitor_handle_command(const char *cmdline)
                         /* for 'i', not specifying a size gives -1 as size */
                         if (size < 0)
                             size = default_fmt_size;
+                        default_fmt_size = size;
                     }
-                    default_fmt_size = size;
                     default_fmt_format = format;
                 } else {
                     count = 1;