diff --git a/src/maomao.c b/src/maomao.c
index 94fe95e..0ff9ea9 100644
--- a/src/maomao.c
+++ b/src/maomao.c
@@ -5770,6 +5770,7 @@ void tagmon(const Arg *arg) {
       selmon = c->mon;
       c->geom = setclient_coordinate_center(c->geom, 0, 0);
       focusclient(c, 1);
+      c->oldgeom = c->geom;
       resize(c, c->geom, 1);
     } else {
       selmon = c->mon;