diff --git a/StopWatch.cpp b/StopWatch.cpp
index 06a95a6..915bda1 100644
--- a/StopWatch.cpp
+++ b/StopWatch.cpp
@@ -21,8 +21,8 @@
 #if defined(_WIN32) || defined(_WIN64)
 
 CStopWatch::CStopWatch() :
-m_frequencyMS(),
 m_frequencyS(),
+m_frequencyMS(),
 m_start()
 {
 	::QueryPerformanceFrequency(&m_frequencyS);
@@ -63,6 +63,7 @@ unsigned int CStopWatch::elapsed()
 #else
 
 #include <cstdio>
+#include <ctime>
 
 CStopWatch::CStopWatch() :
 m_start()
@@ -83,21 +84,19 @@ unsigned long long CStopWatch::time() const
 
 unsigned long CStopWatch::start()
 {
-	::gettimeofday(&m_start, NULL);
+	::clock_gettime(CLOCK_MONOTONIC, &m_start);
 
-	return m_start.tv_usec;
+	return m_start.tv_sec * 1000UL + m_start.tv_nsec / 1000000UL;
 }
 
 unsigned int CStopWatch::elapsed()
 {
-	struct timeval now;
-	::gettimeofday(&now, NULL);
+	struct timespec now;
+	::clock_gettime(CLOCK_MONOTONIC, &now);
 
-	unsigned int elapsed = (now.tv_sec - m_start.tv_sec) * 1000U;
-	elapsed += now.tv_usec / 1000U;
-	elapsed -= m_start.tv_usec / 1000U;
+	int offset = ((now.tv_sec - m_start.tv_sec) * 1000000000UL + now.tv_nsec - m_start.tv_nsec ) / 1000000UL;
 
-	return elapsed;
+	return (unsigned int)offset;
 }
 
 #endif
diff --git a/StopWatch.h b/StopWatch.h
index 3822f0b..8958b25 100644
--- a/StopWatch.h
+++ b/StopWatch.h
@@ -42,7 +42,7 @@ private:
 	LARGE_INTEGER  m_frequencyMS;
 	LARGE_INTEGER  m_start;
 #else
-	struct timeval m_start;
+	struct timespec m_start;
 #endif
 };