diff --git a/app/javascript/mastodon/features/compose/containers/warning_container.js b/app/javascript/mastodon/features/compose/containers/warning_container.js
index dbb80dfb0..8ee8ea190 100644
--- a/app/javascript/mastodon/features/compose/containers/warning_container.js
+++ b/app/javascript/mastodon/features/compose/containers/warning_container.js
@@ -5,7 +5,7 @@ import PropTypes from 'prop-types';
 import { FormattedMessage } from 'react-intl';
 import { me } from '../../../initial_state';
 
-const APPROX_HASHTAG_RE = /(?:^|[^\/\)\w])#(\w*[a-zA-Z]\w*)/i;
+const APPROX_HASHTAG_RE = /(?:^|[^\/\)\w])#(\w*[a-zA-Z·]\w*)/i;
 
 const mapStateToProps = state => ({
   needsLockWarning: state.getIn(['compose', 'privacy']) === 'private' && !state.getIn(['accounts', me, 'locked']),
diff --git a/app/models/tag.rb b/app/models/tag.rb
index dc2c8d129..9fa9405d7 100644
--- a/app/models/tag.rb
+++ b/app/models/tag.rb
@@ -12,7 +12,7 @@
 class Tag < ApplicationRecord
   has_and_belongs_to_many :statuses
 
-  HASHTAG_NAME_RE = '[[:word:]_]*[[:alpha:]_][[:word:]_]*'
+  HASHTAG_NAME_RE = '[[:word:]_]*[[:alpha:]_·][[:word:]_]*'
   HASHTAG_RE = /(?:^|[^\/\)\w])#(#{HASHTAG_NAME_RE})/i
 
   validates :name, presence: true, uniqueness: true, format: { with: /\A#{HASHTAG_NAME_RE}\z/i }