--- screen-4.0.2/fileio.c.varargs	2003-09-08 10:25:28.000000000 -0400
+++ screen-4.0.2/fileio.c	2005-08-23 08:49:21.000000000 -0400
@@ -779,7 +779,7 @@ char *cmd;
 #ifdef SIGPIPE
       signal(SIGPIPE, SIG_DFL);
 #endif
-      execl("/bin/sh", "sh", "-c", cmd, 0);
+      execl("/bin/sh", "sh", "-c", cmd, NULL);
       Panic(errno, "/bin/sh");
     default:
       break;