diff --git a/isisd/isis_main.c b/isisd/isis_main.c
index 1dda43b..bbb1fb2 100644
--- a/isisd/isis_main.c
+++ b/isisd/isis_main.c
@@ -358,8 +358,11 @@
     return(0);
   
   /* demonize */
-  if (daemon_mode)
-    daemon (0, 0);
+  if (daemon_mode && daemon (0, 0) < 0)
+    {
+      zlog_err("IS-IS daemon failed: %s", strerror(errno));
+      exit (1);
+    }
 
   /* Process ID file creation. */
   if (pid_file[0] != '\0')