diff --git a/lib/libutil/Symbol.map b/lib/libutil/Symbol.map
--- a/lib/libutil/Symbol.map
+++ b/lib/libutil/Symbol.map
@@ -120,6 +120,13 @@
 	uu_lock;
 	uu_lockerr;
 	uu_unlock;
+
+	# login_setcryptfmt() uses crypt_set_format() from libcrypt.
+	# To avoid forcing a hard dependency on libcrypt, we provide a
+	# weak stub here.  Applications that use login_setcryptfmt()
+	# should link with libcrypt, which provides an actual
+	# implementation which overrides this stub.
+	crypt_set_format;
 };
 
 FBSDprivate_1.0 {