1 files changed, 1 insertions, 1 deletions
diff --git a/user/kill.c b/user/kill.c
index f20c89f..1b0253b 100644
--- a/user/kill.c
+++ b/user/kill.c
@@ -9,7 +9,7 @@ main(int argc, char **argv)
 
   if(argc < 2){
     fprintf(2, "usage: kill pid...\n");
-    exit(-1);
+    exit(1);
   }
   for(i=1; i<argc; i++)
     kill(atoi(argv[i]));