diff --git a/ANNOUNCE b/ANNOUNCE
index 8d472eb5..86017d32 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
 
-Libpng 1.2.51beta03 - June 18, 2013
+Libpng 1.2.51beta03 - November 28, 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.
@@ -52,7 +52,9 @@ version 1.2.51beta02 [June 13, 2013]
   Avoid a possible memory leak in contrib/gregbook/readpng.c
   Revised libpng.3 so that "doclifter" can process it.
 
-version 1.2.51beta03 [June 18, 2013]
+version 1.2.51beta03 [November 28, 2013]
+  Changed '"%s"m' to '"%s" m' in png_debug macros to improve portability
+    among compilers.
 
 (subscription required; visit
 https://lists.sourceforge.net/lists/listinfo/png-mng-implement
diff --git a/CHANGES b/CHANGES
index d4720ce9..5441698c 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2788,7 +2788,9 @@ version 1.2.51beta02 [June 13, 2013]
   Avoid a possible memory leak in contrib/gregbook/readpng.c
   Revised libpng.3 so that "doclifter" can process it.
 
-version 1.2.51beta03 [June 18, 2013]
+version 1.2.51beta03 [November 28, 2013]
+  Changed '"%s"m' to '"%s" m' in png_debug macros to improve portability
+    among compilers.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/png.h b/png.h
index 449539bf..d103b4eb 100644
--- a/png.h
+++ b/png.h
@@ -1,6 +1,6 @@
 /* png.h - header file for PNG reference library
  *
- * libpng version 1.2.51beta03 - June 18, 2013
+ * libpng version 1.2.51beta03 - November 28, 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.)
@@ -10,7 +10,7 @@
  * Authors and maintainers:
  *  libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
  *  libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
- *  libpng versions 0.97, January 1998, through 1.2.51beta03 - June 18, 2013: Glenn
+ *  libpng versions 0.97, January 1998, through 1.2.51beta03 - November 28, 2013: Glenn
  *  See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
@@ -316,8 +316,8 @@
  *
  * This code is released under the libpng license.
  *
- * libpng versions 1.2.6, August 15, 2004, through 1.2.51beta03, June 18, 2013, are
- * Copyright (c) 2004, 2006-2011 Glenn Randers-Pehrson, and are
+ * libpng versions 1.2.6, August 15, 2004, through 1.2.51beta03, November 28, 2013, are
+ * Copyright (c) 2004, 2006-2013 Glenn Randers-Pehrson, and are
  * distributed according to the same disclaimer and license as libpng-1.2.5
  * with the following individual added to the list of Contributing Authors:
  *
@@ -428,7 +428,7 @@
  * Y2K compliance in libpng:
  * =========================
  *
- *    June 18, 2013
+ *    November 28, 2013
  *
  *    Since the PNG Development group is an ad-hoc body, we can't make
  *    an official declaration.
@@ -492,7 +492,7 @@
 /* Version information for png.h - this should match the version in png.c */
 #define PNG_LIBPNG_VER_STRING "1.2.51beta03"
 #define PNG_HEADER_VERSION_STRING \
-   " libpng version 1.2.51beta03 - June 18, 2013\n"
+   " libpng version 1.2.51beta03 - November 28, 2013\n"
 
 #define PNG_LIBPNG_VER_SONUM   0
 #define PNG_LIBPNG_VER_DLLNUM  13
@@ -2657,7 +2657,7 @@ extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
 #      define png_debug(l,m) \
        { \
        int num_tabs=l; \
-       fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
+       fprintf(PNG_DEBUG_FILE,"%s" m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
          (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
        }
 #    endif
@@ -2665,7 +2665,7 @@ extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
 #      define png_debug1(l,m,p1) \
        { \
        int num_tabs=l; \
-       fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
+       fprintf(PNG_DEBUG_FILE,"%s" m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
          (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
        }
 #    endif
@@ -2673,7 +2673,7 @@ extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
 #      define png_debug2(l,m,p1,p2) \
        { \
        int num_tabs=l; \
-       fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
+       fprintf(PNG_DEBUG_FILE,"%s" m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
          (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
        }
 #    endif