diff --git a/ANNOUNCE b/ANNOUNCE
index 37deded99..34dbe0982 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
 
-Libpng 1.5.23beta01 - March 26, 2015
+Libpng 1.5.23beta01 - March 27, 2015
 
 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.
@@ -27,6 +27,10 @@ Other information:
 
 Changes since the last public release (1.5.22):
 
+Version 1.5.23beta01 [March 27, 2015]
+  Removed unused PNG_SET_CHUNK_[CACHE|MALLOC]_LIMIT_SUPPORTED definitions
+    from pnglibconf.h.prebuilt (Andrew Church).
+
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
 https://lists.sourceforge.net/lists/listinfo/png-mng-implement
diff --git a/CHANGES b/CHANGES
index fafe189d2..c983a47c9 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4334,7 +4334,9 @@ Version 1.5.22rc04 [March 16, 2015]
 Version 1.5.22 [March 26, 2015]
   No changes.
 
-Version 1.5.23beta01 [March 26, 2015]
+Version 1.5.23beta01 [March 27, 2015]
+  Removed unused PNG_SET_CHUNK_[CACHE|MALLOC]_LIMIT_SUPPORTED definitions
+    from pnglibconf.h.prebuilt (Andrew Church).
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/scripts/pnglibconf.h.prebuilt b/scripts/pnglibconf.h.prebuilt
index dcc67d32d..aa2b6b545 100644
--- a/scripts/pnglibconf.h.prebuilt
+++ b/scripts/pnglibconf.h.prebuilt
@@ -1,7 +1,7 @@
 /* 1.5.23beta01 STANDARD API DEFINITION */
 /* pnglibconf.h - library build configuration */
 
-/* libpng version 1.5.23beta01 - March 26, 2015 */
+/* libpng version 1.5.23beta01 - March 27, 2015 */
 
 /* Copyright (c) 1998-2013 Glenn Randers-Pehrson */
 
@@ -95,8 +95,6 @@
 #define PNG_SAVE_INT_32_SUPPORTED
 #define PNG_SEQUENTIAL_READ_SUPPORTED
 #define PNG_SETJMP_SUPPORTED
-#define PNG_SET_CHUNK_CACHE_LIMIT_SUPPORTED
-#define PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED
 /*#undef PNG_SET_OPTION_SUPPORTED*/
 #define PNG_SET_USER_LIMITS_SUPPORTED
 #define PNG_STDIO_SUPPORTED