diff --git a/common/timeDefs.h b/common/timeDefs.h
index eacf0139..a04e5435 100644
--- a/common/timeDefs.h
+++ b/common/timeDefs.h
@@ -5,11 +5,11 @@
 
 namespace chronos
 {
-	using hrc = std::chrono::high_resolution_clock;
-	using time_point_hrc = std::chrono::time_point<hrc>;
-	using sec = std::chrono::seconds;
-	using msec = std::chrono::milliseconds;
-	using usec = std::chrono::microseconds;
+	typedef std::chrono::high_resolution_clock hrc;
+	typedef std::chrono::time_point<hrc> time_point_hrc;
+	typedef std::chrono::seconds sec;
+	typedef std::chrono::milliseconds msec;
+	typedef std::chrono::microseconds usec;
 }