diff --git a/Source/WebCore/platform/ScrollView.cpp b/Source/WebCore/platform/ScrollView.cpp
index 14d961b..7caf820 100644
--- a/Source/WebCore/platform/ScrollView.cpp
+++ b/Source/WebCore/platform/ScrollView.cpp
@@ -57,6 +57,7 @@
     , m_paintsEntireContents(false)
     , m_clipsRepaints(true)
     , m_delegatesScrolling(false)
+    , m_containsScrollableAreaWithOverlayScrollbars(false)
 {
     platformInit();
 }
@@ -982,6 +983,9 @@
         return;
 
     notifyPageThatContentAreaWillPaint();
+
+    // If we encounter any overlay scrollbars as we paint, this will be set to true.
+    m_containsScrollableAreaWithOverlayScrollbars = false;
     
     IntRect documentDirtyRect = rect;
     documentDirtyRect.intersect(frameRect());