diff --git a/ANNOUNCE b/ANNOUNCE
index 1aa8414363d1c333d18d8f49e413e258f2264f17..d82dd7127a6659550fa4784997249230393b71ea 100644
--- a/ANNOUNCE
+++ b/ANNOUNCE
@@ -1,4 +1,4 @@
-Libpng 1.6.28beta01 - December 30, 2016
+Libpng 1.6.28beta01 - December 31, 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.
@@ -25,7 +25,8 @@ Other information:
 
 Changes since the last public release (1.6.27):
 
-Version 1.6.28beta01 [December 30, 2016]
+Version 1.6.28beta01 [December 31, 2016]
+  Fixed arm/aarch64 detection in CMakeLists.txt (Gianfranco Costamagna).
 
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diff --git a/CHANGES b/CHANGES
index b114af4d06e45ba640e9150be1bc0f17ff721f1d..c9cdbccd687d2941170330c114a5ec404ce6c5c1 100644
--- a/CHANGES
+++ b/CHANGES
@@ -5774,7 +5774,8 @@ Version 1.6.27 [December 29, 2016]
   Fixed a potential null pointer dereference in png_set_text_2() (bug report
     and patch by Patrick Keshishian, CVE-2016-10087).
 
-Version 1.6.28beta01 [December 30, 2016]
+Version 1.6.28beta01 [December 31, 2016]
+  Fixed arm/aarch64 detection in CMakeLists.txt (Gianfranco Costamagna).
 
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 (subscription required; visit
diff --git a/CMakeLists.txt b/CMakeLists.txt
index b49ed36ad771dbca0ad82c360de9fa4f6adbe86b..e5d429e9cf17cb2f2980b949b6bae03f47a3d3b0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -71,7 +71,8 @@ set(PNG_PREFIX "" CACHE STRING "Prefix to add to the API function names")
 set(DFA_XTRA "" CACHE FILEPATH "File containing extra configuration settings")
 
 # set definitions and sources for arm
-if(${CMAKE_SYSTEM_PROCESSOR} MATCHES "^arm")
+if(${CMAKE_SYSTEM_PROCESSOR} MATCHES "^arm" OR
+  ${CMAKE_SYSTEM_PROCESSOR} MATCHES "^aarch64")
   set(PNG_ARM_NEON_POSSIBLE_VALUES check on off)
   set(PNG_ARM_NEON "check" CACHE STRING "Enable ARM NEON optimizations:
      check: (default) use internal checking code;