diff --git a/src/port/dirmod.c b/src/port/dirmod.c
index 84039ff38a2..08835962be6 100644
--- a/src/port/dirmod.c
+++ b/src/port/dirmod.c
@@ -34,6 +34,7 @@
 #ifndef __CYGWIN__
 #include <winioctl.h>
 #else
+#include <windows.h>
 #include <w32api/winioctl.h>
 #endif
 #endif