diff --git a/contrib/elftoolchain/libelf/_libelf_config.h b/contrib/elftoolchain/libelf/_libelf_config.h
index b9442fdc81d0..2ad063006c22 100644
--- a/contrib/elftoolchain/libelf/_libelf_config.h
+++ b/contrib/elftoolchain/libelf/_libelf_config.h
@@ -53,6 +53,12 @@
 #define	LIBELF_BYTEORDER	ELFDATA2LSB
 #define	LIBELF_CLASS		ELFCLASS64
 
+#elif	defined(__aarch64__)
+
+#define	LIBELF_ARCH		EM_AARCH64
+#define	LIBELF_BYTEORDER	ELFDATA2LSB
+#define	LIBELF_CLASS		ELFCLASS64
+
 #elif	defined(__arm__)
 
 #define	LIBELF_ARCH		EM_ARM