diff --git a/content/xslt/src/xpath/nsXPathResult.cpp b/content/xslt/src/xpath/nsXPathResult.cpp
index 2d3971c8c2b..c57a0c9a26b 100644
--- a/content/xslt/src/xpath/nsXPathResult.cpp
+++ b/content/xslt/src/xpath/nsXPathResult.cpp
@@ -212,7 +212,7 @@ nsXPathResult::CharacterDataChanged(nsIDocument* aDocument,
 
 void
 nsXPathResult::AttributeChanged(nsIDocument* aDocument,
-                                nsIContent* aContent,
+                                nsIStyledContent* aContent,
                                 PRInt32 aNameSpaceID,
                                 nsIAtom* aAttribute,
                                 PRInt32 aModType)
diff --git a/content/xslt/src/xslt/txMozillaXSLTProcessor.cpp b/content/xslt/src/xslt/txMozillaXSLTProcessor.cpp
index 778262620a7..0169330af26 100644
--- a/content/xslt/src/xslt/txMozillaXSLTProcessor.cpp
+++ b/content/xslt/src/xslt/txMozillaXSLTProcessor.cpp
@@ -1014,7 +1014,7 @@ txMozillaXSLTProcessor::CharacterDataChanged(nsIDocument* aDocument,
 
 void
 txMozillaXSLTProcessor::AttributeChanged(nsIDocument* aDocument,
-                                         nsIContent* aContent,
+                                         nsIStyledContent* aContent,
                                          PRInt32 aNameSpaceID,
                                          nsIAtom* aAttribute,
                                          PRInt32 aModType)