diff --git a/src/machine/machine-varlink.c b/src/machine/machine-varlink.c
index 0f14e3063a..f75f481e6e 100644
--- a/src/machine/machine-varlink.c
+++ b/src/machine/machine-varlink.c
@@ -332,7 +332,7 @@ int vl_method_kill(sd_varlink *link, sd_json_variant *parameters, sd_varlink_met
         static const sd_json_dispatch_field dispatch_table[] = {
                 VARLINK_DISPATCH_MACHINE_LOOKUP_FIELDS(struct params),
                 { "whom",   SD_JSON_VARIANT_STRING,         sd_json_dispatch_const_string, offsetof(struct params, swhom), 0 },
-                { "signal", _SD_JSON_VARIANT_TYPE_INVALID , sd_json_dispatch_int32,        offsetof(struct params, signo), SD_JSON_MANDATORY },
+                { "signal", _SD_JSON_VARIANT_TYPE_INVALID , sd_json_dispatch_signal,       offsetof(struct params, signo), SD_JSON_MANDATORY },
                 VARLINK_DISPATCH_POLKIT_FIELD,
                 {}
         };
@@ -364,9 +364,6 @@ int vl_method_kill(sd_varlink *link, sd_json_variant *parameters, sd_varlink_met
                         return sd_varlink_error_invalid_parameter_name(link, "whom");
         }
 
-        if (!SIGNAL_VALID(p.signo))
-                return sd_varlink_error_invalid_parameter_name(link, "signal");
-
         r = varlink_verify_polkit_async(
                         link,
                         manager->bus,