diff --git a/StopWatch.cpp b/StopWatch.cpp
index 046a943..154e62d 100644
--- a/StopWatch.cpp
+++ b/StopWatch.cpp
@@ -17,6 +17,7 @@
  */
 
 #include "StopWatch.h"
+#include <time.h>
 
 #if defined(_WIN32) || defined(_WIN64)