diff --git a/native_mate/converter.cc b/native_mate/converter.cc
index cc66b8d39078..2c9d95f94171 100644
--- a/native_mate/converter.cc
+++ b/native_mate/converter.cc
@@ -31,6 +31,7 @@ bool Converter<bool>::FromV8(Isolate* isolate, Handle<Value> val, bool* out) {
   return true;
 }
 
+#if !defined(OS_LINUX)
 Handle<Value> Converter<unsigned long>::ToV8(Isolate* isolate,
                                              unsigned long val) {
   return MATE_INTEGER_NEW(isolate, val);
@@ -43,7 +44,7 @@ bool Converter<unsigned long>::FromV8(Isolate* isolate, Handle<Value> val,
   *out = val->IntegerValue();
   return true;
 }
-
+#endif
 
 Handle<Value> Converter<int32_t>::ToV8(Isolate* isolate, int32_t val) {
   return MATE_INTEGER_NEW(isolate, val);
diff --git a/native_mate/converter.h b/native_mate/converter.h
index 37d86f82bf01..e2fe3e885cf7 100644
--- a/native_mate/converter.h
+++ b/native_mate/converter.h
@@ -33,6 +33,7 @@ struct Converter<bool> {
                      bool* out);
 };
 
+#if !defined(OS_LINUX)
 template<>
 struct Converter<unsigned long> {
   static v8::Handle<v8::Value> ToV8(v8::Isolate* isolate,
@@ -41,6 +42,7 @@ struct Converter<unsigned long> {
                      v8::Handle<v8::Value> val,
                      unsigned long* out);
 };
+#endif
 
 template<>
 struct Converter<int32_t> {