diff --git a/ANNOUNCE b/ANNOUNCE
index 1dc6e2576..8cbf646d8 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -301,7 +301,8 @@ Version 1.6.0beta17 [March 10, 2012]
 Version 1.6.0beta18 [March 11, 2012]
   Issue a png_benign_error() instead of png_warning() about bad palette index.
   In pngtest, treat benign errors as errors if "-strict" is present.
-  Fix an off-by-one error in the palette index checking function.
+  Fixed an off-by-one error in the palette index checking function.
+  Fixed a compiler warning under Cygwin (Windows-7, 32-bit system)
 
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diff --git a/CHANGES b/CHANGES
index 21b3f58a9..ea8437152 100644
--- a/CHANGES
+++ b/CHANGES
@@ -4052,7 +4052,8 @@ Version 1.6.0beta17 [March 10, 2012]
 Version 1.6.0beta18 [March 11, 2012]
   Issue a png_benign_error() instead of png_warning() about bad palette index.
   In pngtest, treat benign errors as errors if "-strict" is present.
-  Fix an off-by-one error in the palette index checking function.
+  Fixed an off-by-one error in the palette index checking function.
+  Fixed a compiler warning under Cygwin (Windows-7, 32-bit system)
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/contrib/libtests/pngvalid.c b/contrib/libtests/pngvalid.c
index eb0504cb1..6e454d4c0 100644
--- a/contrib/libtests/pngvalid.c
+++ b/contrib/libtests/pngvalid.c
@@ -4653,8 +4653,8 @@ standard_check_text(png_const_structp pp, png_const_textp tp,
       if (tp->text_length != strlen(text))
       {
          char buf[64];
-         sprintf(buf, "text length changed[%lu->%lu], ", strlen(text),
-            tp->text_length);
+         sprintf(buf, "text length changed[%lu->%lu], ",
+            (unsigned long)strlen(text), (unsigned long)tp->text_length);
          pos = safecat(msg, sizeof msg, pos, buf);
       }