diff --git a/main.c b/main.c
index a76b4794..c4a7ddf7 100644
--- a/main.c
+++ b/main.c
@@ -695,9 +695,10 @@ main (argc, argv, envp)
   /* Set up to handle children dying.  This must be done before
      reading in the makefiles so that `shell' function calls will work.  */
 
-#if	defined (SIGCHLD) && !defined (USG)
+#ifdef SIGCHLD
   (void) signal (SIGCHLD, child_handler);
-#else
+#endif
+#ifdef SIGCLD
   (void) signal (SIGCLD, child_handler);
 #endif