diff --git a/src/thread.c b/src/thread.c
index f72c88c..5accf2d 100644
--- a/src/thread.c
+++ b/src/thread.c
@@ -16,6 +16,7 @@
 #include <stdlib.h>
 
 #ifdef _WIN32
+#define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #else
 #include <pthread.h>