diff -Naur zlib-1.2.2/inftrees.c zlib-1.2.2.new/inftrees.c
--- zlib-1.2.2/inftrees.c	2004-09-15 15:30:06.000000000 +0100
+++ zlib-1.2.2.new/inftrees.c	2005-07-10 14:30:32.000000000 +0100
@@ -134,7 +134,7 @@
         left -= count[len];
         if (left < 0) return -1;        /* over-subscribed */
     }
-    if (left > 0 && (type == CODES || (codes - count[0] != 1)))
+    if (left > 0 && (type == CODES || max != 1))
         return -1;                      /* incomplete set */
 
     /* generate offsets into symbol table for each length for sorting */