1 files changed, 4 insertions, 0 deletions
diff --git a/c/lex.c b/c/lex.c
index d6aa95a..63b066b 100644
--- a/c/lex.c
+++ b/c/lex.c
@@ -2065,6 +2065,10 @@ addpredefmacros(struct arena **tmparena)
       putdef1("__x86_64__");
       putdef1("__x86_64");
       break;
+   case ISaarch64:
+      putdef1("__aarch64");
+      putdef1("__aarch64__");
+      break;
    }
 
    if (target.os != OSunknown) putdef1("__STDC_HOSTED__");