diff --git a/secure/simul_efun/query_ip_name.c b/secure/simul_efun/query_ip_name.c
index 4ad213e..e489a29 100644
--- a/secure/simul_efun/query_ip_name.c
+++ b/secure/simul_efun/query_ip_name.c
@@ -37,7 +37,7 @@
   if(objectp(ob) && interactive(ob))
   {
     string realip = ob->query_realip();
-    if (sizeof(ob->query_realip()))
+    if (sizeof(realip))
     {
       return realip;
     }