diff --git a/src/juce_appframework/gui/components/windows/juce_TopLevelWindow.cpp b/src/juce_appframework/gui/components/windows/juce_TopLevelWindow.cpp
index c349ea748b..f0e6618ad6 100644
--- a/src/juce_appframework/gui/components/windows/juce_TopLevelWindow.cpp
+++ b/src/juce_appframework/gui/components/windows/juce_TopLevelWindow.cpp
@@ -225,6 +225,7 @@ void TopLevelWindow::setDropShadowEnabled (const bool useShadow)
 
     if (isOnDesktop())
     {
+        deleteAndZero (shadower);
         Component::addToDesktop (getDesktopWindowStyleFlags());
     }
     else