--- a/include/Random123/features/gccfeatures.h
+++ b/include/Random123/features/gccfeatures.h
@@ -34,8 +34,8 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 #define R123_GNUC_VERSION (__GNUC__*10000 + __GNUC_MINOR__*100 + __GNUC_PATCHLEVEL__)

-#if !defined(__x86_64__) && !defined(__i386__) && !defined(__powerpc__)
-#  error "This code has only been tested on x86 and powerpc platforms."
+#if !defined(__x86_64__) && !defined(__i386__) && !defined(__powerpc__) && !defined(__aarch64__)
+#  error "This code has only been tested on x86, arm, and powerpc platforms."
 #include <including_a_nonexistent_file_will_stop_some_compilers_from_continuing_with_a_hopeless_task>
 { /* maybe an unbalanced brace will terminate the compilation */
  /* Feel free to try the Random123 library on other architectures by changing