diff --git a/source/windows/thread.c b/source/windows/thread.c
index b053cc411..b172178ce 100644
--- a/source/windows/thread.c
+++ b/source/windows/thread.c
@@ -11,7 +11,6 @@
 #include <aws/common/string.h>
 
 #include <windows.h>
-#include <winnt.h>
 
 #include <inttypes.h>