diff --git a/ANNOUNCE b/ANNOUNCE
index 67bab66a..91df7705 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
 
-Libpng 1.2.51beta01 - January 3, 2013
+Libpng 1.2.51beta01 - January 22, 2013
 
 This is not intended to be a public release.  It will be replaced
 within a few weeks by a public version or by another test version.
@@ -42,10 +42,11 @@ Other information:
 
 Changes since the last public release (1.2.50):
 
-version 1.2.51beta01 [January 3, 2013]
+version 1.2.51beta01 [January 22, 2013]
   Ignore, with a warning, out-of-range value of num_trans in png_set_tRNS().
   Replaced AM_CONFIG_HEADER(config.h) with AC_CONFIG_HEADERS([config.h])
     in configure.ac
+  Change default value of PNG_USER_CACHE_MAX from 0 to 32767 in pngconf.h.
 
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 https://lists.sourceforge.net/lists/listinfo/png-mng-implement
diff --git a/CHANGES b/CHANGES
index 79eaf2d5..127dc951 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2777,11 +2777,12 @@ version 1.0.59 and 1.2.49 [March 29, 2012]
 version 1.0.60 and 1.2.50 [July 9, 2012]
   Changed "a+w" to "u+w" in Makefile.in to fix CVE-2012-3386.
 
-version 1.2.51beta01 [January 3, 2013]
+version 1.2.51beta01 [January 22, 2013]
   Rebuilt the configure scripts with autoconf-2.69
   Ignore, with a warning, out-of-range value of num_trans in png_set_tRNS().
   Replaced AM_CONFIG_HEADER(config.h) with AC_CONFIG_HEADERS([config.h])
     in configure.ac
+  Change default value of PNG_USER_CACHE_MAX from 0 to 32767 in pngconf.h.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
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diff --git a/pngconf.h b/pngconf.h
index 9952be1d..1a708493 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,7 +1,7 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.2.51beta01 - January 1, 2013
+ * libpng version 1.2.51beta01 - January 22, 2013
  * Copyright (c) 1998-2013 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -868,7 +868,7 @@
  * how large, set these two limits to 0.
  */
 #ifndef PNG_USER_CHUNK_CACHE_MAX
-#  define PNG_USER_CHUNK_CACHE_MAX 0
+#  define PNG_USER_CHUNK_CACHE_MAX 32765
 #endif
 
 /* Added at libpng-1.2.43 */