diff --git a/ANNOUNCE b/ANNOUNCE
index cc6827f19..aa7cb331a 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
 
-Libpng 1.4.13beta04 - June 18, 2013
+Libpng 1.4.13beta04 - 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.
@@ -47,7 +47,9 @@ version 1.4.13beta03 [June 18, 2013]
   Removed a redundant test from png_set_IHDR().
   Revised libpng.3 so that "doclifter" can process it.
 
-version 1.4.13beta04 [June 18, 2013]
+version 1.4.13beta04 [November 28, 2013]
+  Changed '"%s"m' to '"%s" m' in png_debug macros to improve portability
+    among compilers.
 
 Send comments/corrections/commendations to glennrp at users.sourceforge.net
 or to png-mng-implement at lists.sf.net (subscription required; visit
diff --git a/CHANGES b/CHANGES
index cb5de977d..ca793575d 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2889,7 +2889,9 @@ version 1.4.13beta03 [June 18, 2013]
   Removed a redundant test from png_set_IHDR().
   Revised libpng.3 so that "doclifter" can process it.
 
-version 1.4.13beta04 [June 18, 2013]
+version 1.4.13beta04 [November 28, 2013]
+  Changed '"%s"m' to '"%s" m' in png_debug macros to improve portability
+    among compilers.
 
 Send comments/corrections/commendations to glennrp at users.sourceforge.net
 or to png-mng-implement at lists.sf.net (subscription required; visit
diff --git a/pngpriv.h b/pngpriv.h
index 471ecdf9e..b392edc86 100644
--- a/pngpriv.h
+++ b/pngpriv.h
@@ -1,7 +1,7 @@
 
 /* pngpriv.h - private declarations for use inside libpng
  *
- * libpng version 1.4.13beta04 - June 18, 2013
+ * libpng version 1.4.13beta04 - November 28, 2013
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2011 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -886,7 +886,7 @@ PNG_EXTERN void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp 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
@@ -894,7 +894,7 @@ PNG_EXTERN void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp 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
@@ -902,7 +902,7 @@ PNG_EXTERN void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp 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