diff --git a/ANNOUNCE b/ANNOUNCE
index 2dc4b7346..6f717064c 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
 
-Libpng 1.5.0beta34 - July 6, 2010
+Libpng 1.5.0beta34 - July 11, 2010
 
 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.
@@ -226,7 +226,7 @@ version 1.5.0beta24 [May 7, 2010]
     offset of the png_ptr->rowbuf pointer into png_ptr->big_row_buf.
   Added more blank lines for readability.
 
-version 1.5.0beta25 [July 6, 2010]
+version 1.5.0beta25 [July 11, 2010]
   In pngpread.c: png_push_have_row() add check for new_row > height
   Removed the now-redundant check for out-of-bounds new_row from example.c
 
@@ -278,7 +278,8 @@ version 1.5.0beta33 [July 6, 2010]
   Changed "extern PNG_EXPORT" to "PNG_EXPORT" in png.h (Jan Nijtmans)
   Changed "extern" to "PNG_EXTERN" in pngpriv.h (except for the 'extern "C" {')
 
-version 1.5.0beta34 [July 6, 2010]
+version 1.5.0beta34 [July 11, 2010]
+  Put #ifndef PNG_EXTERN, #endif around the define PNG_EXTERN in pngpriv.h
 
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diff --git a/pngpriv.h b/pngpriv.h
index 885c2dc97..db69502e3 100644
--- a/pngpriv.h
+++ b/pngpriv.h
@@ -1,7 +1,7 @@
 
 /* pngpriv.h - private declarations for use inside libpng
  *
- * libpng version 1.5.0beta34 - July 6, 2010
+ * libpng version 1.5.0beta34 - July 11, 2010
  * For conditions of distribution and use, see copyright notice in png.h
  * Copyright (c) 1998-2010 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -143,14 +143,16 @@
 #  define PNG_GAMMA_THRESHOLD 0.05
 #endif
 
+#ifndef PNG_EXTERN
 /* The functions exported by PNG_EXTERN are internal functions, which
  * aren't usually used outside the library (as far as I know), so it is
  * debatable if they should be exported at all.  In the future, when it
  * is possible to have run-time registry of chunk-handling functions,
  * some of these will be made available again.
-#define PNG_EXTERN extern
+#  define PNG_EXTERN extern
  */
-#define PNG_EXTERN
+#  define PNG_EXTERN
+#endif
 
 /* Other defines specific to compilers can go here.  Try to keep
  * them inside an appropriate ifdef/endif pair for portability.