--- a/src/tools/tor-fw-helper/tor-fw-helper-natpmp.c
+++ b/src/tools/tor-fw-helper/tor-fw-helper-natpmp.c
@@ -8,6 +8,7 @@
   **/
 
 #include "orconfig.h"
+#include "compat.h"
 #ifdef NAT_PMP
 #ifdef _WIN32
 #define STATICLIB