diff --git a/screen.go b/screen.go
index 20847fd..faa91cc 100644
--- a/screen.go
+++ b/screen.go
@@ -119,6 +119,8 @@ func (s *Screen) drawloop() {
 
 		if s.buf == nil || s.buf.Width() != w || s.buf.Height() != h {
 			s.buf = buf2d.NewBuffer(w, h, DefaultRune)
+		} else {
+			s.buf.Fill(DefaultRune)
 		}
 
 		rw, rh := s.Root.Layout()