diff --git a/lib/libc/gen/nlist.c b/lib/libc/gen/nlist.c
index bdadd55389c3..ec878c5bebc5 100644
--- a/lib/libc/gen/nlist.c
+++ b/lib/libc/gen/nlist.c
@@ -47,7 +47,10 @@ __FBSDID("$FreeBSD$");
 #include <unistd.h>
 #include "un-namespace.h"
 
+/* There is no a.out support on arm64 */
+#ifndef __aarch64__
 #define _NLIST_DO_AOUT
+#endif
 #define _NLIST_DO_ELF
 
 #ifdef _NLIST_DO_ELF