diff --git a/portreasons.h b/portreasons.h
index d43f3e571..9f9e5a04d 100644
--- a/portreasons.h
+++ b/portreasons.h
@@ -102,6 +102,8 @@
 #ifndef REASON_H
 #define REASON_H
 
+#include "nmap.h"
+
 #ifdef WIN32
 #include "winsock2.h"
 #else