diff --git a/ANNOUNCE b/ANNOUNCE
index 92708d08d..65f1e4699 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,5 +1,5 @@
 
-Libpng 1.7.0beta67 - October 2, 2015
+Libpng 1.7.0beta67 - October 3, 2015
 
 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.
@@ -944,7 +944,12 @@ Version 1.7.0beta66 [October 2, 2015]
     extended sBIT handling to the colormap code in the simplified API
     which is separately implemented in pngread.c (John Bowler).
 
-Version 1.7.0beta67 [October 2, 2015]
+Version 1.7.0beta67 [October 3, 2015]
+  Fixed 'pow' macros in pngvalid.c. It is legal for 'pow' to be a
+    macro, therefore the argument list cannot contain preprocessing
+    directives.  Make sure pow is a function where this happens. This is
+    a minimal safe fix, the issue only arises in non-performance-critical
+    code (bug report by Curtis Leach, fix by John Bowler).
 
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diff --git a/CHANGES b/CHANGES
index be8484f61..1bd1d3754 100644
--- a/CHANGES
+++ b/CHANGES
@@ -5243,8 +5243,13 @@ Version 1.7.0beta66 [October 2, 2015]
     extended sBIT handling to the colormap code in the simplified API
     which is separately implemented in pngread.c (John Bowler).
 
-Version 1.7.0beta67 [October 2, 2015]
-
+Version 1.7.0beta67 [October 3, 2015]
+  Fixed 'pow' macros in pngvalid.c. It is legal for 'pow' to be a
+    macro, therefore the argument list cannot contain preprocessing
+    directives.  Make sure pow is a function where this happens. This is
+    a minimal safe fix, the issue only arises in non-performance-critical
+    code (bug report by Curtis Leach, fix by John Bowler).
+    
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