diff --git a/include/ptycon/ptycon.h b/include/ptycon/ptycon.h
index d91238a..f53c764 100644
--- a/include/ptycon/ptycon.h
+++ b/include/ptycon/ptycon.h
@@ -1,6 +1,7 @@
 #ifndef PTYCON_H
 #define PTYCON_H
 
+#include <ntapi/ntapi.h>
 #include <stdint.h>
 
 #include "ptycon_api.h"