diff --git a/bindings/ruby/rbsigar.c b/bindings/ruby/rbsigar.c
index 2852faf1..f41712a6 100644
--- a/bindings/ruby/rbsigar.c
+++ b/bindings/ruby/rbsigar.c
@@ -575,6 +575,10 @@ static void Init_rbsigar_constants(VALUE rclass)
     RB_SIGAR_CONST_INT(TCP_BOUND);
     RB_SIGAR_CONST_INT(TCP_UNKNOWN);
 
+    RB_SIGAR_CONST_INT(RTF_UP);
+    RB_SIGAR_CONST_INT(RTF_GATEWAY);
+    RB_SIGAR_CONST_INT(RTF_HOST);
+
     RB_SIGAR_CONST_STR(NULL_HWADDR);
 }