--- ansi.c.orig	2014-05-01 12:51:14.000000000 +0200
+++ ansi.c	2014-05-01 21:33:29.000000000 +0200
@@ -568,7 +568,7 @@
 		{
 		case '0': case '1': case '2': case '3': case '4':
 		case '5': case '6': case '7': case '8': case '9':
-		  if (curr->w_NumArgs < MAXARGS)
+		  if (curr->w_NumArgs >= 0 && curr->w_NumArgs < MAXARGS)
 		    {
 		      if (curr->w_args[curr->w_NumArgs] < 100000000)
 			curr->w_args[curr->w_NumArgs] =