diff --git a/include/rapidjson/document.h b/include/rapidjson/document.h
index da3a826..2a602ee 100644
--- a/include/rapidjson/document.h
+++ b/include/rapidjson/document.h
@@ -448,7 +448,7 @@ int z = a[0u].GetInt();				// This works too.
 	int GetInt() const			{ RAPIDJSON_ASSERT(flags_ & kIntFlag);   return data_.n.i.i;   }
 	unsigned GetUint() const	{ RAPIDJSON_ASSERT(flags_ & kUintFlag);  return data_.n.u.u;   }
 	int64_t GetInt64() const	{ RAPIDJSON_ASSERT(flags_ & kInt64Flag); return data_.n.i64; }
-	int64_t GetUint64() const	{ RAPIDJSON_ASSERT(flags_ & kInt64Flag); return data_.n.u64; }
+	uint64_t GetUint64() const	{ RAPIDJSON_ASSERT(flags_ & kInt64Flag); return data_.n.u64; }
 
 	double GetDouble() const {
 		RAPIDJSON_ASSERT(IsNumber());