diff --git a/enrol/paypal/lang/en/enrol_paypal.php b/enrol/paypal/lang/en/enrol_paypal.php
index d15a2bb3e61..803d5604fa1 100644
--- a/enrol/paypal/lang/en/enrol_paypal.php
+++ b/enrol/paypal/lang/en/enrol_paypal.php
@@ -37,7 +37,7 @@ $string['enrolenddate'] = 'End date';
 $string['enrolenddate_help'] = 'If enabled, users can be enrolled until this date only.';
 $string['enrolenddaterror'] = 'Enrolment end date cannot be earlier than start date';
 $string['enrolperiod'] = 'Enrolment duration';
-$string['enrolperiod_desc'] = 'Default length of time that the enrolment is valid (in seconds). If set to zero, the enrolment duration will be unlimited by default.';
+$string['enrolperiod_desc'] = 'Default length of time that the enrolment is valid. If set to zero, the enrolment duration will be unlimited by default.';
 $string['enrolperiod_help'] = 'Length of time that the enrolment is valid, starting with the moment the user is enrolled. If disabled, the enrolment duration will be unlimited.';
 $string['enrolstartdate'] = 'Start date';
 $string['enrolstartdate_help'] = 'If enabled, users can be enrolled from this date onward only.';
diff --git a/enrol/paypal/settings.php b/enrol/paypal/settings.php
index 80ac4c81bfa..6e3acfbf933 100644
--- a/enrol/paypal/settings.php
+++ b/enrol/paypal/settings.php
@@ -68,6 +68,6 @@ if ($ADMIN->fulltree) {
             get_string('defaultrole', 'enrol_paypal'), get_string('defaultrole_desc', 'enrol_paypal'), $student->id, $options));
     }
 
-    $settings->add(new admin_setting_configtext('enrol_paypal/enrolperiod',
-        get_string('enrolperiod', 'enrol_paypal'), get_string('enrolperiod_desc', 'enrol_paypal'), 0, PARAM_INT));
+    $settings->add(new admin_setting_configduration('enrol_paypal/enrolperiod',
+        get_string('enrolperiod', 'enrol_paypal'), get_string('enrolperiod_desc', 'enrol_paypal'), 0));
 }