diff --git a/src/core/load-fragment-gperf.gperf.m4 b/src/core/load-fragment-gperf.gperf.m4
index 5b5a86250e..7fb39cf948 100644
--- a/src/core/load-fragment-gperf.gperf.m4
+++ b/src/core/load-fragment-gperf.gperf.m4
@@ -194,7 +194,7 @@ Unit.OnFailureIsolate,           config_parse_job_mode_isolate,      0,
 Unit.IgnoreOnIsolate,            config_parse_bool,                  0,                             offsetof(Unit, ignore_on_isolate)
 Unit.IgnoreOnSnapshot,           config_parse_warn_compat,           DISABLED_LEGACY,               0
 Unit.JobTimeoutSec,              config_parse_sec_fix_0,             0,                             offsetof(Unit, job_timeout)
-Unit.JobRunningTimeoutSec,       config_parse_sec,                   0,                             offsetof(Unit, job_running_timeout)
+Unit.JobRunningTimeoutSec,       config_parse_sec_fix_0,             0,                             offsetof(Unit, job_running_timeout)
 Unit.JobTimeoutAction,           config_parse_emergency_action,      0,                             offsetof(Unit, job_timeout_action)
 Unit.JobTimeoutRebootArgument,   config_parse_unit_string_printf,    0,                             offsetof(Unit, job_timeout_reboot_arg)
 Unit.StartLimitIntervalSec,      config_parse_sec,                   0,                             offsetof(Unit, start_limit.interval)