Source/ZenLib/Thread.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/Source/ZenLib/Thread.h b/Source/ZenLib/Thread.h
index 73ff573..6464479 100644
--- a/Source/ZenLib/Thread.h
+++ b/Source/ZenLib/Thread.h
@@ -28,6 +28,7 @@
 #ifndef ZenLib_ThreadH
 #define ZenLib_ThreadH
 //---------------------------------------------------------------------------
+#include <cstddef>
 #include "ZenLib/Conf.h"
 #include "ZenLib/CriticalSection.h"
 #ifdef _WINDOWS