diff --git a/WebKit2/ChangeLog b/WebKit2/ChangeLog
index 5443f24..2bd4661 100644
--- a/WebKit2/ChangeLog
+++ b/WebKit2/ChangeLog
@@ -1,5 +1,17 @@
 2010-11-24  Andreas Kling  <kling@webkit.org>

+        Reviewed by NOBODY (OOPS!).
+
+        [Qt][WK2] Make deep copies of tile images
+
+        We need the tile images we get from UpdateChunk::createImage() to persist,
+        so we should take a copy() of them.
+
+        * UIProcess/qt/TiledDrawingAreaTileQt.cpp:
+        (WebKit::TiledDrawingAreaTile::updateFromChunk):
+
+2010-11-24  Andreas Kling  <kling@webkit.org>
+
         Reviewed by Kenneth Rohde Christiansen.

         [Qt] Fix uninitialized variable in QGraphicsWKViewPrivate
diff --git a/WebKit2/UIProcess/qt/TiledDrawingAreaTileQt.cpp b/WebKit2/UIProcess/qt/TiledDrawingAreaTileQt.cpp
index f4ca678..5f95d02 100644
--- a/WebKit2/UIProcess/qt/TiledDrawingAreaTileQt.cpp
+++ b/WebKit2/UIProcess/qt/TiledDrawingAreaTileQt.cpp
@@ -170,9 +170,10 @@ void TiledDrawingAreaTile::updateFromChunk(UpdateChunk* updateChunk, float)
 #ifdef TILE_DEBUG_LOG
     qDebug() << "tile updated id=" << ID() << " rect=" << QRect(updateChunkRect);
 #endif
-    if (updateChunkRect.size() == m_proxy->tileSize())
-        m_backBuffer = QPixmap::fromImage(image);
-    else {
+    if (updateChunkRect.size() == m_proxy->tileSize()) {
+        // Make a deep copy of the image since it's in shared memory.
+        m_backBuffer = QPixmap::fromImage(image.copy());
+    } else {
         if (m_backBuffer.isNull())
             m_backBuffer = m_buffer.isNull() ? QPixmap(m_proxy->tileSize()) : m_buffer;
         QPainter painter(&m_backBuffer);