diff --git a/src/core/load-fragment-gperf.gperf.m4 b/src/core/load-fragment-gperf.gperf.m4
index eff2b0e741..ef990161ad 100644
--- a/src/core/load-fragment-gperf.gperf.m4
+++ b/src/core/load-fragment-gperf.gperf.m4
@@ -291,7 +291,7 @@ Service.StartLimitInterval,      config_parse_sec,                   0,
 Service.StartLimitBurst,         config_parse_unsigned,              0,                             offsetof(Unit, start_limit.burst)
 Service.StartLimitAction,        config_parse_emergency_action,      0,                             offsetof(Unit, start_limit_action)
 Service.FailureAction,           config_parse_emergency_action,      0,                             offsetof(Unit, failure_action)
-Service.RebootArgument,          config_parse_unit_path_printf,      0,                             offsetof(Unit, reboot_arg)
+Service.RebootArgument,          config_parse_unit_string_printf,    0,                             offsetof(Unit, reboot_arg)
 Service.Type,                    config_parse_service_type,          0,                             offsetof(Service, type)
 Service.Restart,                 config_parse_service_restart,       0,                             offsetof(Service, restart)
 Service.PermissionsStartOnly,    config_parse_bool,                  0,                             offsetof(Service, permissions_start_only)