diff --git a/wiz.c b/wiz.c
index b2ac72e..e070b6a 100644
--- a/wiz.c
+++ b/wiz.c
@@ -98,8 +98,10 @@ run(char **cmd)
   if (killchild && cpid)
     kill(cpid, SIGINT);
   if (cmd && (cpid = fork()) == 0) {
-    dup2(STDERR_FILENO, STDOUT_FILENO);
-    setsid();
+    if (dup2(STDERR_FILENO, STDOUT_FILENO) == -1)
+      die("dup2 failed:");
+    if (setsid() == -1)
+      die("setsid failed:");
     execvp(cmd[0], cmd);
     die("execvp failed:");
   }