diff --git a/WebCore/css/CSSStyleSheet.cpp b/WebCore/css/CSSStyleSheet.cpp
index 63fd21b8..2685185 100644
--- a/WebCore/css/CSSStyleSheet.cpp
+++ b/WebCore/css/CSSStyleSheet.cpp
@@ -190,12 +190,17 @@
 
 void CSSStyleSheet::styleSheetChanged()
 {
+    StyleBase* root = this;
+    while (StyleBase* parent = root->parent())
+        root = parent;
+    Document* documentToUpdate = (root && root->isCSSStyleSheet()) ? static_cast<CSSStyleSheet*>(root)->doc() : 0;
+    
     /* FIXME: We don't need to do everything updateStyleSelector does,
      * basically we just need to recreate the document's selector with the
      * already existing style sheets.
      */
-    if (m_doc)
-        m_doc->updateStyleSelector();
+    if (documentToUpdate)
+        documentToUpdate->updateStyleSelector();
 }
 
 }