--- Zlib.xs	2008-09-02 23:02:41.000000000 +0200
+++ Zlib.xs.oden	2009-07-19 21:56:12.000000000 +0200
@@ -1322,7 +1322,7 @@ inflate (s, buf, output, eof=FALSE)
     while (RETVAL == Z_OK) {
         if (s->stream.avail_out == 0 ) {
 	    /* out of space in the output buffer so make it bigger */
-            Sv_Grow(output, SvLEN(output) + bufinc) ;
+            Sv_Grow(output, SvLEN(output) + bufinc +1) ;
             cur_length += increment ;
             s->stream.next_out = (Bytef*) SvPVbyte_nolen(output) + cur_length ;
             increment = bufinc ;