diff --git a/src/libssh2_priv.h b/src/libssh2_priv.h
index 4f3708d..c670a16 100644
--- a/src/libssh2_priv.h
+++ b/src/libssh2_priv.h
@@ -44,7 +44,11 @@
 #include "libssh2_config.h"
 
 #ifdef HAVE_WINDOWS_H
+#ifndef WIN32_LEAN_AND_MEAN
+#define WIN32_LEAN_AND_MEAN
+#endif
 #include <windows.h>
+#undef WIN32_LEAN_AND_MEAN
 #endif
 
 #ifdef HAVE_WS2TCPIP_H