diff --git a/Foundation/src/Timestamp.cpp b/Foundation/src/Timestamp.cpp
index bba23aa4f..aaf91cb00 100644
--- a/Foundation/src/Timestamp.cpp
+++ b/Foundation/src/Timestamp.cpp
@@ -38,6 +38,15 @@
 #endif
 
 
+#ifndef POCO_HAVE_CLOCK_GETTIME
+#if (defined(_POSIX_TIMERS) && defined(CLOCK_REALTIME)) || defined(POCO_VXWORKS) || defined(__QNX__)
+#ifndef __APPLE__ // See GitHub issue #1453 - not available before Mac OS 10.12/iOS 10
+#define POCO_HAVE_CLOCK_GETTIME
+#endif
+#endif
+#endif
+
+
 #if defined(_WIN32_WCE) && defined(POCO_WINCE_TIMESTAMP_HACK)
 
 
@@ -226,7 +235,7 @@ void Timestamp::update()
 	ts.QuadPart -= epoch.QuadPart;
 	_ts = ts.QuadPart/10;
 
-#elif (defined(_POSIX_TIMERS) && defined(CLOCK_REALTIME)) || defined(POCO_VXWORKS) || defined(__QNX__)
+#elif defined(POCO_HAVE_CLOCK_GETTIME)
 
 	struct timespec ts;
 	if (clock_gettime(CLOCK_REALTIME, &ts))