diff --git a/src/komodo_curve25519.h b/src/komodo_curve25519.h
index cba40561b..fd65b9ae3 100644
--- a/src/komodo_curve25519.h
+++ b/src/komodo_curve25519.h
@@ -81,7 +81,7 @@ bits320 fexpand(bits256 basepoint)
     return(out);
 }
 
-#if __amd64__
+#if defined(__amd64__) || defined(__aarch64)
 // donna: special gcc mode for 128-bit integers. It's implemented on 64-bit platforms only as far as I know.
 typedef unsigned uint128_t __attribute__((mode(TI)));