diff --git a/contrib/jemalloc/include/jemalloc/jemalloc_FreeBSD.h b/contrib/jemalloc/include/jemalloc/jemalloc_FreeBSD.h
index 94554bcc5da..75b9b91e75f 100644
--- a/contrib/jemalloc/include/jemalloc/jemalloc_FreeBSD.h
+++ b/contrib/jemalloc/include/jemalloc/jemalloc_FreeBSD.h
@@ -40,6 +40,9 @@
 #ifdef __arm__
 #  define LG_SIZEOF_PTR		2
 #endif
+#ifdef __aarch64__
+#  define LG_SIZEOF_PTR		3
+#endif
 #ifdef __mips__
 #ifdef __mips_n64
 #  define LG_SIZEOF_PTR		3