diff --git a/auto/os/conf b/auto/os/conf
index 7c6cb691a..d7f6e0382 100644
--- a/auto/os/conf
+++ b/auto/os/conf
@@ -110,7 +110,7 @@ case "$NGX_MACHINE" in
         NGX_MACH_CACHE_LINE=64
     ;;
 
-    aarch64 )
+    aarch64 | arm64)
         have=NGX_ALIGNMENT value=16 . auto/define
         NGX_MACH_CACHE_LINE=64
     ;;