diff --git a/ANNOUNCE b/ANNOUNCE
index 741a731..1dbb9ef 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,4 +1,4 @@
-Libpng 1.6.26beta05 - October 3, 2016
+Libpng 1.6.26beta05 - October 5, 2016
 
 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.
@@ -61,7 +61,9 @@
     when PNG_USE_ABS is defined.
   Fixed offsets in contrib/intel/intel_sse.patch
 
-Version 1.6.26beta05 [October 3, 2016]
+Version 1.6.26beta05 [October 5, 2016]
+  Changed integer constant 4294967294 to unsigned 4294967294U in pngconf.h
+    to avoid a signed/unsigned compare in the preprocessor.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/CHANGES b/CHANGES
index e08964f..e26ce5e 100644
--- a/CHANGES
+++ b/CHANGES
@@ -5739,7 +5739,9 @@
     when PNG_USE_ABS is defined.
   Fixed offsets in contrib/intel/intel_sse.patch
 
-Version 1.6.26beta05 [October 3, 2016]
+Version 1.6.26beta05 [October 5, 2016]
+  Changed integer constant 4294967294 to unsigned 4294967294U in pngconf.h
+    to avoid a signed/unsigned compare in the preprocessor.
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/pngconf.h b/pngconf.h
index 2e2ccd7..1e27bc8 100644
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,7 +1,7 @@
 
 /* pngconf.h - machine configurable file for libpng
  *
- * libpng version 1.6.26beta05, October 3, 2016
+ * libpng version 1.6.26beta05, October 5, 2016
  *
  * Copyright (c) 1998-2002,2004,2006-2016 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
@@ -507,9 +507,9 @@
 #  error "libpng requires a signed 32-bit (or more) type"
 #endif
 
-#if UINT_MAX > 4294967294
+#if UINT_MAX > 4294967294U
    typedef unsigned int png_uint_32;
-#elif ULONG_MAX > 4294967294
+#elif ULONG_MAX > 4294967294U
    typedef unsigned long int png_uint_32;
 #else
 #  error "libpng requires an unsigned 32-bit (or more) type"