diff --git a/content/xbl/src/nsXBLProtoImplMethod.cpp b/content/xbl/src/nsXBLProtoImplMethod.cpp
index 692b5f8e15b..b76cd3bd2dd 100644
--- a/content/xbl/src/nsXBLProtoImplMethod.cpp
+++ b/content/xbl/src/nsXBLProtoImplMethod.cpp
@@ -273,9 +273,7 @@ nsXBLProtoImplMethod::Read(nsIScriptContext* aContext,
                            nsIObjectInputStream* aStream)
 {
   void* methodCode;
-  PRUint32 lineNumber;
-  nsresult rv = XBL_DeserializeFunction(aContext, aStream, this,
-                                        &lineNumber, &methodCode);
+  nsresult rv = XBL_DeserializeFunction(aContext, aStream, this, &methodCode);
   mJSMethodObject = (JSObject *)methodCode;
   if (NS_FAILED(rv)) {
     SetUncompiledMethod(nsnull);
@@ -299,8 +297,7 @@ nsXBLProtoImplMethod::Write(nsIScriptContext* aContext,
   rv = aStream->WriteWStringZ(mName);
   NS_ENSURE_SUCCESS(rv, rv);
 
-  // XXXndeakin fix line number
-  return XBL_SerializeFunction(aContext, aStream, mJSMethodObject, 0);
+  return XBL_SerializeFunction(aContext, aStream, mJSMethodObject);
 }
 
 nsresult
@@ -394,8 +391,7 @@ nsXBLProtoImplAnonymousMethod::Write(nsIScriptContext* aContext,
     nsresult rv = aStream->Write8(aType);
     NS_ENSURE_SUCCESS(rv, rv);
 
-    // XXXndeakin write out line number
-    rv = XBL_SerializeFunction(aContext, aStream, mJSMethodObject, 0);
+    rv = XBL_SerializeFunction(aContext, aStream, mJSMethodObject);
     NS_ENSURE_SUCCESS(rv, rv);
   }
 
diff --git a/content/xbl/src/nsXBLProtoImplProperty.cpp b/content/xbl/src/nsXBLProtoImplProperty.cpp
index 95d3518f8cf..2cea12ef94e 100644
--- a/content/xbl/src/nsXBLProtoImplProperty.cpp
+++ b/content/xbl/src/nsXBLProtoImplProperty.cpp
@@ -361,12 +361,11 @@ nsXBLProtoImplProperty::Read(nsIScriptContext* aContext,
                              XBLBindingSerializeDetails aType)
 {
   nsresult rv;
-  PRUint32 lineNumber;
   void* scriptObject;
 
   if (aType == XBLBinding_Serialize_GetterProperty ||
       aType == XBLBinding_Serialize_GetterSetterProperty) {
-    rv = XBL_DeserializeFunction(aContext, aStream, this, &lineNumber, &scriptObject);
+    rv = XBL_DeserializeFunction(aContext, aStream, this, &scriptObject);
     NS_ENSURE_SUCCESS(rv, rv);
 
     mJSGetterObject = (JSObject *)scriptObject;
@@ -375,7 +374,7 @@ nsXBLProtoImplProperty::Read(nsIScriptContext* aContext,
 
   if (aType == XBLBinding_Serialize_SetterProperty ||
       aType == XBLBinding_Serialize_GetterSetterProperty) {
-    rv = XBL_DeserializeFunction(aContext, aStream, this, &lineNumber, &scriptObject);
+    rv = XBL_DeserializeFunction(aContext, aStream, this, &scriptObject);
     NS_ENSURE_SUCCESS(rv, rv);
 
     mJSSetterObject = (JSObject *)scriptObject;
@@ -414,14 +413,12 @@ nsXBLProtoImplProperty::Write(nsIScriptContext* aContext,
   NS_ENSURE_SUCCESS(rv, rv);
 
   if (mJSAttributes & JSPROP_GETTER) {
-    // XXXndeakin write out line number
-    rv = XBL_SerializeFunction(aContext, aStream, mJSGetterObject, 0);
+    rv = XBL_SerializeFunction(aContext, aStream, mJSGetterObject);
     NS_ENSURE_SUCCESS(rv, rv);
   }
 
   if (mJSAttributes & JSPROP_SETTER) {
-    // XXXndeakin write out line number
-    rv = XBL_SerializeFunction(aContext, aStream, mJSSetterObject, 0);
+    rv = XBL_SerializeFunction(aContext, aStream, mJSSetterObject);
     NS_ENSURE_SUCCESS(rv, rv);
   }
 
diff --git a/content/xbl/src/nsXBLSerialize.cpp b/content/xbl/src/nsXBLSerialize.cpp
index 7348e9ccc2d..bba6a7091b6 100644
--- a/content/xbl/src/nsXBLSerialize.cpp
+++ b/content/xbl/src/nsXBLSerialize.cpp
@@ -43,11 +43,9 @@
 nsresult
 XBL_SerializeFunction(nsIScriptContext* aContext,
                       nsIObjectOutputStream* aStream,
-                      JSObject* aFunctionObject,
-                      PRUint32 aLineNumber)
+                      JSObject* aFunctionObject)
 {
-  nsresult rv = aStream->Write32(aLineNumber);
-  NS_ENSURE_SUCCESS(rv, rv);
+  nsresult rv;
 
   JSContext* cx = (JSContext*) aContext->GetNativeContext();
   JSXDRState *xdr = ::JS_XDRNewMem(cx, JSXDR_ENCODE);
@@ -81,19 +79,14 @@ nsresult
 XBL_DeserializeFunction(nsIScriptContext* aContext,
                         nsIObjectInputStream* aStream,
                         void* aHolder,
-                        PRUint32* aLineNumber,
                         void **aScriptObject)
 {
   *aScriptObject = nsnull;
 
-  nsresult rv = aStream->Read32(aLineNumber);
-  if (NS_FAILED(rv))
-    return rv;
-
   JSObject* functionObject = nsnull;
 
   PRUint32 size;
-  rv = aStream->Read32(&size);
+  nsresult rv = aStream->Read32(&size);
   if (NS_FAILED(rv))
     return rv;
 
diff --git a/content/xbl/src/nsXBLSerialize.h b/content/xbl/src/nsXBLSerialize.h
index 53805b6c2c1..ca4f7b11afa 100644
--- a/content/xbl/src/nsXBLSerialize.h
+++ b/content/xbl/src/nsXBLSerialize.h
@@ -108,14 +108,12 @@ PR_STATIC_ASSERT(XBLBinding_Serialize_CustomNamespace >= kNameSpaceID_LastBuilti
 nsresult
 XBL_SerializeFunction(nsIScriptContext* aContext,
                       nsIObjectOutputStream* aStream,
-                      JSObject* aFunctionObject,
-                      PRUint32 aLineNumber);
+                      JSObject* aFunctionObject);
 
 nsresult
 XBL_DeserializeFunction(nsIScriptContext* aContext,
                         nsIObjectInputStream* aStream,
                         void* aHolder,
-                        PRUint32* aLineNumber,
                         void **aScriptObject);
 
 #endif // nsXBLSerialize_h__