diff --git a/ANNOUNCE b/ANNOUNCE
index 96f6bb834..74571fbbe 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -52,6 +52,7 @@ version 1.4.4beta04 [July 31, 2010]
 version 1.4.4beta05 [August 4, 2010]
   Updated projects/visualc71 so it can find scripts/pnglibconf.h
   Removed unused png_mem_* defines from pngconf.h.
+  Correct use of _WINDOWS_ in pngconf.h
 
 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 c303dac8b..aa6e46166 100644
--- a/CHANGES
+++ b/CHANGES
@@ -2636,6 +2636,7 @@ version 1.4.4beta04 [July 31, 2010]
 version 1.4.4beta05 [August 4, 2010]
   Updated projects/visualc71 so it can find scripts/pnglibconf.h
   Removed unused png_mem_* defines from pngconf.h.
+  Correct use of _WINDOWS_ in pngconf.h
 
 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/pngconf.h b/pngconf.h
index 819f665d4..47dcd0148 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1124,7 +1124,7 @@ typedef unsigned char png_byte;
 #else
    typedef size_t png_size_t;
 #endif
-#define png_sizeof(x) sizeof(x)
+#define png_sizeof(x) (sizeof (x))
 
 /* The following is needed for medium model support.  It cannot be in the
  * pngpriv.h header.  Needs modification for other compilers besides
@@ -1428,14 +1428,10 @@ typedef char            FAR * FAR * FAR * png_charppp;
 
 /* memory model/platform independent fns */
 #ifndef PNG_ABORT
-#  ifdef _WIN32_WCE
-#    define PNG_ABORT() exit(-1)
+#  ifdef _WINDOWS_
+#     define PNG_ABORT() ExitProcess(0)
 #  else
-#    ifdef _WINDOWS_
-#       define PNG_ABORT() ExitProcess(0)
-#    else
-#       define PNG_ABORT() abort()
-#    endif
+#     define PNG_ABORT() abort()
 #  endif
 #endif
 
@@ -1514,8 +1510,13 @@ typedef char            FAR * FAR * FAR * png_charppp;
 #  if defined(_MSC_VER) && defined(MAXSEG_64K)
      typedef unsigned long    png_alloc_size_t;
 #  else
-#    if defined(_WINDOWS_) && (!defined(INT_MAX) || INT_MAX <= 0x7ffffffeL)
-       typedef DWORD            png_alloc_size_t;
+     /* This is an attempt to detect an old Windows system where (int) is
+      * actually 16 bits, in that case png_malloc must have an argument with a
+      * bigger size to accomodate the requirements of the library.
+      */
+#    if (defined(_Windows) || defined(_WINDOWS) || defined(_WINDOWS_)) && \
+        (!defined(INT_MAX) || INT_MAX <= 0x7ffffffeL)
+       typedef DWORD         png_alloc_size_t;
 #    else
        typedef png_size_t    png_alloc_size_t;
 #    endif
diff --git a/pngpriv.h b/pngpriv.h
index 2079b2949..22b96df4c 100644
--- a/pngpriv.h
+++ b/pngpriv.h
@@ -1,7 +1,7 @@
 
 /* pngpriv.h - private declarations for use inside libpng
  *
- * libpng version 1.4.4beta05 - August 3, 2010
+ * libpng version 1.4.4beta05 - August 4, 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)
@@ -77,10 +77,6 @@
 #if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \
     defined(_WIN32) || defined(__WIN32__)
 #  include <windows.h>  /* defines _WINDOWS_ macro */
-/* I have no idea why is this necessary... */
-#  ifdef _MSC_VER
-#    include <malloc.h>
-#  endif
 #endif
 
 /* Various modes of operation.  Note that after an init, mode is set to