diff --git a/app/javascript/mastodon/features/compose/components/poll_form.js b/app/javascript/mastodon/features/compose/components/poll_form.js
index ede29b8a0..c58db6467 100644
--- a/app/javascript/mastodon/features/compose/components/poll_form.js
+++ b/app/javascript/mastodon/features/compose/components/poll_form.js
@@ -165,6 +165,7 @@ class PollForm extends ImmutablePureComponent {
             <option value={1800}>{intl.formatMessage(messages.minutes, { number: 30 })}</option>
             <option value={3600}>{intl.formatMessage(messages.hours, { number: 1 })}</option>
             <option value={21600}>{intl.formatMessage(messages.hours, { number: 6 })}</option>
+            <option value={43200}>{intl.formatMessage(messages.hours, { number: 12 })}</option>
             <option value={86400}>{intl.formatMessage(messages.days, { number: 1 })}</option>
             <option value={259200}>{intl.formatMessage(messages.days, { number: 3 })}</option>
             <option value={604800}>{intl.formatMessage(messages.days, { number: 7 })}</option>