diff --git a/src/xcb.c b/src/xcb.c
index 0b4531c9..b9ba009e 100644
--- a/src/xcb.c
+++ b/src/xcb.c
@@ -222,8 +222,8 @@ void fake_absolute_configure_notify(xcb_connection_t *conn, Client *client) {
 
         absolute.x = client->rect.x;
         absolute.y = client->rect.y;
-        absolute.width = client->rect.width - client->child_rect.x;
-        absolute.height = client->rect.height - client->child_rect.y;
+        absolute.width = client->rect.width - (2 * client->child_rect.x);
+        absolute.height = client->rect.height - (2 * client->child_rect.y);
 
         fake_configure_notify(conn, absolute, client->child);
 }