diff --git a/include/os/osThread.h b/include/os/osThread.h
index f39c01abee..73c499b1dc 100644
--- a/include/os/osThread.h
+++ b/include/os/osThread.h
@@ -22,7 +22,7 @@
 extern "C" {
 #endif
 
-#if defined(WINDOWS)
+#ifdef WINDOWS
 #include <tlhelp32.h>
 #include <windows.h>
 #endif