diff --git a/CMakeLists.txt b/CMakeLists.txt
index 38e9d13..302720f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -155,6 +155,10 @@ external/mx25519/src/portable/scalarmult.c
 if(CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64" OR CMAKE_SYSTEM_PROCESSOR MATCHES "AMD64" OR CMAKE_SYSTEM_PROCESSOR MATCHES "amd64")
 	list(APPEND SOURCES external/mx25519/src/amd64/scalarmult_gnu.S)
 endif()
+if(CMAKE_SYSTEM_PROCESSOR MATCHES "aarch64" OR CMAKE_SYSTEM_PROCESSOR MATCHES "arm64" OR CMAKE_SYSTEM_PROCESSOR MATCHES "armv8")
+	list(APPEND SOURCES external/mx25519/src/arm64/scalarmult.S)
+	set_source_files_properties(external/mx25519/src/arm64/scalarmult.S PROPERTIES LANGUAGE C)
+endif()
 
 list(APPEND SOURCES
 external/src/hardforks/hardforks.cpp