diff --git a/scene/main/viewport.cpp b/scene/main/viewport.cpp
index c85fda23712..00362476256 100644
--- a/scene/main/viewport.cpp
+++ b/scene/main/viewport.cpp
@@ -5070,6 +5070,7 @@ void SubViewport::_internal_set_size(const Size2i &p_size, bool p_force) {
 
 	if (c) {
 		c->update_minimum_size();
+		c->queue_redraw();
 	}
 }