diff --git a/app/javascript/mastodon/features/ui/components/mute_modal.jsx b/app/javascript/mastodon/features/ui/components/mute_modal.jsx
index e9dc1a7c2ec..df466cfac6a 100644
--- a/app/javascript/mastodon/features/ui/components/mute_modal.jsx
+++ b/app/javascript/mastodon/features/ui/components/mute_modal.jsx
@@ -118,7 +118,7 @@ export const MuteModal = ({ accountId, acct }) => {
             <RadioButtonLabel name='duration' value='0' label={intl.formatMessage(messages.indefinite)} currentValue={muteDuration} onChange={handleChangeMuteDuration} />
             <RadioButtonLabel name='duration' value='86400' label={intl.formatMessage(messages.hours, { number: 24 })} currentValue={muteDuration} onChange={handleChangeMuteDuration} />
             <RadioButtonLabel name='duration' value='604800' label={intl.formatMessage(messages.days, { number: 7 })} currentValue={muteDuration} onChange={handleChangeMuteDuration} />
-            <RadioButtonLabel name='duration' value='x' label={intl.formatMessage(messages.days, { number: 30 })} currentValue={muteDuration} onChange={handleChangeMuteDuration} />
+            <RadioButtonLabel name='duration' value='2592000' label={intl.formatMessage(messages.days, { number: 30 })} currentValue={muteDuration} onChange={handleChangeMuteDuration} />
           </div>
 
           <div className='safety-action-modal__field-group'>