diff --git a/src/app/ui/brush_popup.cpp b/src/app/ui/brush_popup.cpp
index c27ca0474..4f205c719 100644
--- a/src/app/ui/brush_popup.cpp
+++ b/src/app/ui/brush_popup.cpp
@@ -289,8 +289,13 @@ void BrushPopup::regenerate(const gfx::Rect& box)
 void BrushPopup::onBrushChanges()
 {
   if (isVisible()) {
+    gfx::Region rgn;
+    getDrawableRegion(rgn, DrawableRegionFlags(kCutTopWindows | kUseChildArea));
+
     regenerate(bounds());
     invalidate();
+
+    parent()->invalidateRegion(rgn);
   }
 }