diff --git a/ANNOUNCE b/ANNOUNCE
index 02762bd0f..b4de50d01 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
 
-Libpng 1.7.0beta23 - November 7, 2013
+Libpng 1.7.0beta23 - November 17, 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.
@@ -418,7 +418,8 @@ Version 1.7.0beta22 [November 7, 2013]
   Fixed #include in filter_neon_intrinsics.c and ctype macros. The ctype char
     checking macros take an unsigned char argument, not a signed char.
 
-Version 1.7.0beta23 [November 7, 2013]
+Version 1.7.0beta23 [November 17, 2013]
+  Added #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED/#endif in pngpread.c
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
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diff --git a/CHANGES b/CHANGES
index d3c404b9b..cf59ca4b6 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4707,7 +4707,8 @@ Version 1.7.0beta22 [November 7, 2013]
   Fixed #include in filter_neon_intrinsics.c and ctype macros. The ctype char
     checking macros take an unsigned char argument, not a signed char.
 
-Version 1.7.0beta23 [November 7, 2013]
+Version 1.7.0beta23 [November 17, 2013]
+  Added #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED/#endif in pngpread.c
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/pngpread.c b/pngpread.c
index bce6cc4b9..681269ccd 100644
--- a/pngpread.c
+++ b/pngpread.c
@@ -530,6 +530,7 @@ png_push_read_chunk(png_structrp png_ptr, png_inforp info_ptr)
    }
 
 #endif
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
    else
    {
       if (png_ptr->push_length + 4 > png_ptr->buffer_size)
@@ -540,6 +541,7 @@ png_push_read_chunk(png_structrp png_ptr, png_inforp info_ptr)
       png_handle_unknown(png_ptr, info_ptr, png_ptr->push_length,
          PNG_HANDLE_CHUNK_AS_DEFAULT);
    }
+#endif
 
    png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
 }