diff --git a/ANNOUNCE b/ANNOUNCE
index 0f7d18a19b820815b0802e637099db4ca166cf65..7789cc045b6440333db3c18298d5ba5d8ff5fd19 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,4 +1,4 @@
-Libpng 1.6.32beta12 - August 7, 2017
+Libpng 1.6.32beta12 - August 11, 2017
 
 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.
@@ -94,11 +94,14 @@ Version 1.6.32beta11 [August 7, 2017]
     after the keyword has been read.
   Check that the eXIf chunk has at least 2 bytes and begins with "II" or "MM".
 
-Version 1.6.32beta12 [August 7, 2017]
+Version 1.6.32beta12 [August 11, 2017]
   Added a set of "huge_xxxx_chunk.png" files to contrib/testpngs/crashers,
     one for each known chunk type, with length = 2GB-1.
   Check for 0 return from png_get_rowbytes() in contrib/pngminus/*.c to stop
     some Coverity issues (162705, 162706, and 162707).
+  Renamed chunks in contrib/testpngs/crashers to avoid having files whose
+    names differ only in case; this causes problems with some platforms
+    (github issue #172).
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/CHANGES b/CHANGES
index 133fd79b62524a590c72bcca23aebef558854905..fd6465c2f5160203ee93690d7d160d5590f5aee3 100644
--- a/CHANGES
+++ b/CHANGES
@@ -5977,11 +5977,14 @@ Version 1.6.32beta11 [August 7, 2017]
     after the keyword has been read.
   Check that the eXIf chunk has at least 2 bytes and begins with "II" or "MM".
 
-Version 1.6.32beta12 [August 7, 2017]
+Version 1.6.32beta12 [August 11, 2017]
   Added a set of "huge_xxxx_chunk.png" files to contrib/testpngs/crashers,
     one for each known chunk type, with length = 2GB-1.
   Check for 0 return from png_get_rowbytes() in contrib/pngminus/*.c to stop
     some Coverity issues (162705, 162706, and 162707).
+  Renamed chunks in contrib/testpngs/crashers to avoid having files whose
+    names differ only in case; this causes problems with some platforms
+    (github issue #172).
 
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
diff --git a/contrib/testpngs/crashers/huge_juNK_chunk.png b/contrib/testpngs/crashers/huge_juNK_unsafe_to_copy.png
similarity index 100%
rename from contrib/testpngs/crashers/huge_juNK_chunk.png
rename to contrib/testpngs/crashers/huge_juNK_unsafe_to_copy.png
diff --git a/contrib/testpngs/crashers/huge_juNk_chunk.png b/contrib/testpngs/crashers/huge_juNk_safe_to_copy.png
similarity index 100%
rename from contrib/testpngs/crashers/huge_juNk_chunk.png
rename to contrib/testpngs/crashers/huge_juNk_safe_to_copy.png