diff --git a/src/engine/jam.h b/src/engine/jam.h
index 875187fc8..2895906af 100644
--- a/src/engine/jam.h
+++ b/src/engine/jam.h
@@ -375,7 +375,8 @@
     #define OSPLAT "OSPLAT=MIPS"
 #endif
 
-#ifdef __arm__
+#if defined( __arm__ ) || \
+    defined( __aarch64__ )
     #define OSPLAT "OSPLAT=ARM"
 #endif