diff --git a/usr.sbin/crunch/crunchide/exec_elf32.c b/usr.sbin/crunch/crunchide/exec_elf32.c
index 61375ead36c..89080e932e5 100644
--- a/usr.sbin/crunch/crunchide/exec_elf32.c
+++ b/usr.sbin/crunch/crunchide/exec_elf32.c
@@ -178,6 +178,9 @@ ELFNAMEEND(check)(int fd, const char *fn)
 	switch (xe16toh(eh.e_machine)) {
 	case EM_386: break;
 	case EM_ALPHA: break;
+#ifndef EM_AARCH64
+#define	EM_AARCH64	183
+#endif
 	case EM_AARCH64: break;
 	case EM_ARM: break;
 	case EM_MIPS: break;