diff --git a/StopWatch.cpp b/StopWatch.cpp
index f00658d..f5b9aac 100644
--- a/StopWatch.cpp
+++ b/StopWatch.cpp
@@ -51,6 +51,8 @@ unsigned int CStopWatch::elapsed()
 
 #else
 
+#include <cstdio>
+
 CStopWatch::CStopWatch() :
 m_start()
 {