diff --git a/src/machine/machinectl.c b/src/machine/machinectl.c
index 146fe6e99c..20fe2d1b0f 100644
--- a/src/machine/machinectl.c
+++ b/src/machine/machinectl.c
@@ -1694,7 +1694,7 @@ static int make_service_name(const char *name, char **ret) {
 
         assert(name);
         assert(ret);
-        assert(arg_runner >= 0 && arg_runner < (MachineRunner) ELEMENTSOF(machine_runner_unit_prefix_table));
+        assert(arg_runner >= 0 && arg_runner < _RUNNER_MAX);
 
         if (!hostname_is_valid(name, 0))
                 return log_error_errno(SYNTHETIC_ERRNO(EINVAL),