diff --git a/Source/WebCore/xml/XSLTProcessor.h b/Source/WebCore/xml/XSLTProcessor.h
index 518e1e2..6ffee02 100644
--- Source/WebCore/xml/XSLTProcessor.h
+++ Source/WebCore/xml/XSLTProcessor.h
@@ -64,7 +64,7 @@ public:
 
     void reset();
 
-    static void parseErrorFunc(void* userData, xmlError*);
+    static void parseErrorFunc(void* userData, const xmlError*);
     static void genericErrorFunc(void* userData, const char* msg, ...);
     
     // Only for libXSLT callbacks
diff --git a/Source/WebCore/xml/XSLTProcessorLibxslt.cpp b/Source/WebCore/xml/XSLTProcessorLibxslt.cpp
index 8093118..cd68332 100644
--- Source/WebCore/xml/XSLTProcessorLibxslt.cpp
+++ Source/WebCore/xml/XSLTProcessorLibxslt.cpp
@@ -77,7 +77,7 @@ void XSLTProcessor::genericErrorFunc(void*, const char*, ...)
     // It would be nice to do something with this error message.
 }
 
-void XSLTProcessor::parseErrorFunc(void* userData, xmlError* error)
+void XSLTProcessor::parseErrorFunc(void* userData, const xmlError* error)
 {
     PageConsole* console = static_cast<PageConsole*>(userData);
     if (!console)