diff --git a/gfx/src/mac/nsNativeThemeMac.cpp b/gfx/src/mac/nsNativeThemeMac.cpp
index f6608442c855..31d0baf3e24a 100644
--- a/gfx/src/mac/nsNativeThemeMac.cpp
+++ b/gfx/src/mac/nsNativeThemeMac.cpp
@@ -812,6 +812,7 @@ nsNativeThemeMac::ThemeSupportsWidget(nsIPresContext* aPresContext, nsIFrame* aF
     case NS_THEME_SCROLLBAR_TRACK_VERTICAL:
     case NS_THEME_SCROLLBAR_TRACK_HORIZONTAL:
       retVal = PR_TRUE;
+      break;
   
     case NS_THEME_LISTBOX:
     case NS_THEME_DROPDOWN: