diff --git a/widget/TextEvents.h b/widget/TextEvents.h
index 0c9311d5a5c5..5e4d78151539 100644
--- a/widget/TextEvents.h
+++ b/widget/TextEvents.h
@@ -53,6 +53,10 @@ namespace plugins {
 
 struct AlternativeCharCode
 {
+  AlternativeCharCode() :
+    mUnshiftedCharCode(0), mShiftedCharCode(0)
+  {
+  }
   AlternativeCharCode(uint32_t aUnshiftedCharCode, uint32_t aShiftedCharCode) :
     mUnshiftedCharCode(aUnshiftedCharCode), mShiftedCharCode(aShiftedCharCode)
   {
diff --git a/widget/nsGUIEventIPC.h b/widget/nsGUIEventIPC.h
index 0f8114043c1f..4228bae4ef3e 100644
--- a/widget/nsGUIEventIPC.h
+++ b/widget/nsGUIEventIPC.h
@@ -290,6 +290,25 @@ struct ParamTraits<mozilla::WidgetTouchEvent>
   }
 };
 
+template<>
+struct ParamTraits<mozilla::AlternativeCharCode>
+{
+  typedef mozilla::AlternativeCharCode paramType;
+
+  static void Write(Message* aMsg, const paramType& aParam)
+  {
+    WriteParam(aMsg, aParam.mUnshiftedCharCode);
+    WriteParam(aMsg, aParam.mShiftedCharCode);
+  }
+
+  static bool Read(const Message* aMsg, void** aIter, paramType* aResult)
+  {
+    return ReadParam(aMsg, aIter, &aResult->mUnshiftedCharCode) &&
+           ReadParam(aMsg, aIter, &aResult->mShiftedCharCode);
+  }
+};
+
+
 template<>
 struct ParamTraits<mozilla::WidgetKeyboardEvent>
 {
@@ -304,6 +323,7 @@ struct ParamTraits<mozilla::WidgetKeyboardEvent>
     WriteParam(aMsg, aParam.mCodeValue);
     WriteParam(aMsg, aParam.keyCode);
     WriteParam(aMsg, aParam.charCode);
+    WriteParam(aMsg, aParam.alternativeCharCodes);
     WriteParam(aMsg, aParam.isChar);
     WriteParam(aMsg, aParam.mIsRepeat);
     WriteParam(aMsg, aParam.location);
@@ -323,6 +343,7 @@ struct ParamTraits<mozilla::WidgetKeyboardEvent>
         ReadParam(aMsg, aIter, &aResult->mCodeValue) &&
         ReadParam(aMsg, aIter, &aResult->keyCode) &&
         ReadParam(aMsg, aIter, &aResult->charCode) &&
+        ReadParam(aMsg, aIter, &aResult->alternativeCharCodes) &&
         ReadParam(aMsg, aIter, &aResult->isChar) &&
         ReadParam(aMsg, aIter, &aResult->mIsRepeat) &&
         ReadParam(aMsg, aIter, &aResult->location) &&