--- a/ipc/chromium/src/chrome/common/ipc_message_utils.h
+++ b/ipc/chromium/src/chrome/common/ipc_message_utils.h
@@ -261,31 +261,31 @@ struct ParamTraitsFundamental<double> {
 
 template <class P>
 struct ParamTraitsFixed : ParamTraitsFundamental<P> {};
 
 template <>
 struct ParamTraitsFixed<int16_t> {
   typedef int16_t param_type;
   static void Write(Message* m, const param_type& p) {
-    m->WriteInt(p);
+    m->WriteInt16(p);
   }
   static bool Read(const Message* m, void** iter, param_type* r) {
     return m->ReadInt16(iter, r);
   }
   static void Log(const param_type& p, std::wstring* l) {
     l->append(StringPrintf(L"%hd", p));
   }
 };
 
 template <>
 struct ParamTraitsFixed<uint16_t> {
   typedef uint16_t param_type;
   static void Write(Message* m, const param_type& p) {
-    m->WriteInt(p);
+    m->WriteUInt16(p);
   }
   static bool Read(const Message* m, void** iter, param_type* r) {
     return m->ReadUInt16(iter, r);
   }
   static void Log(const param_type& p, std::wstring* l) {
     l->append(StringPrintf(L"%hu", p));
   }
 };