diff --git a/libs/libnatpmp/getgateway.c b/libs/libnatpmp/getgateway.c
index b667b04643..e1f5536a50 100644
--- a/libs/libnatpmp/getgateway.c
+++ b/libs/libnatpmp/getgateway.c
@@ -45,7 +45,7 @@
 #define USE_SYSCTL_NET_ROUTE
 #endif
 
-#if (defined(sun) && defined(__SVR4))
+#if ((defined(sun) || defined(__sun)) && defined(__SVR4))
 #undef USE_PROC_NET_ROUTE
 #define USE_SOCKET_ROUTE
 #undef USE_SYSCTL_NET_ROUTE