diff --git a/app/javascript/mastodon/api_types/accounts.ts b/app/javascript/mastodon/api_types/accounts.ts
index 3f8b27497f..396cb95430 100644
--- a/app/javascript/mastodon/api_types/accounts.ts
+++ b/app/javascript/mastodon/api_types/accounts.ts
@@ -26,6 +26,7 @@ export interface BaseApiAccountJSON {
   fields: ApiAccountFieldJSON[];
   followers_count: number;
   following_count: number;
+  used_languages: string[];
   group: boolean;
   header: string;
   header_static: string;
diff --git a/app/javascript/mastodon/features/subscribed_languages_modal/index.jsx b/app/javascript/mastodon/features/subscribed_languages_modal/index.jsx
index 895a2686e8..00a7cadfd5 100644
--- a/app/javascript/mastodon/features/subscribed_languages_modal/index.jsx
+++ b/app/javascript/mastodon/features/subscribed_languages_modal/index.jsx
@@ -20,10 +20,10 @@ const messages = defineMessages({
 });
 
 const getAccountLanguages = createSelector([
-  (state, accountId) => state.getIn(['timelines', `account:${accountId}`, 'items'], ImmutableList()),
-  state => state.get('statuses'),
-], (statusIds, statuses) =>
-  ImmutableSet(statusIds.map(statusId => statuses.get(statusId)).filter(status => !status.get('reblog')).map(status => status.get('language'))));
+  (state, accountId) => state.getIn(['accounts', accountId, 'used_languages']),
+], (used_languages) => {
+  return ImmutableSet(used_languages);
+});
 
 const mapStateToProps = (state, { accountId }) => ({
   acct: state.getIn(['accounts', accountId, 'acct']),
diff --git a/app/javascript/mastodon/models/account.ts b/app/javascript/mastodon/models/account.ts
index 2666059b40..de0b853672 100644
--- a/app/javascript/mastodon/models/account.ts
+++ b/app/javascript/mastodon/models/account.ts
@@ -97,6 +97,7 @@ export const accountDefaultValues: AccountShape = {
   // This comes from `ApiMutedAccountJSON`, but we should eventually
   // store that in a different object.
   mute_expires_at: null,
+  used_languages: []
 };
 
 const AccountFactory = ImmutableRecord<AccountShape>(accountDefaultValues);
diff --git a/app/models/account_stat.rb b/app/models/account_stat.rb
index 14aa7ef800..b7561c1059 100644
--- a/app/models/account_stat.rb
+++ b/app/models/account_stat.rb
@@ -36,4 +36,12 @@ class AccountStat < ApplicationRecord
   def statuses_count
     [attributes['statuses_count'], 0].max
   end
+
+  def used_languages
+    list = Status.where(account_id: attributes['account_id'])
+          .distinct
+          .reorder(:language)
+          .pluck(:language)
+    list
+  end
 end
diff --git a/app/models/concerns/account/counters.rb b/app/models/concerns/account/counters.rb
index 536d5ca7bc..1f457faa0e 100644
--- a/app/models/concerns/account/counters.rb
+++ b/app/models/concerns/account/counters.rb
@@ -17,6 +17,7 @@ module Account::Counters
            :followers_count,
            :followers_count=,
            :last_status_at,
+           :used_languages,
            to: :account_stat
 
   # @param [Symbol] key
diff --git a/app/serializers/rest/account_serializer.rb b/app/serializers/rest/account_serializer.rb
index 354d384464..1a0715b40c 100644
--- a/app/serializers/rest/account_serializer.rb
+++ b/app/serializers/rest/account_serializer.rb
@@ -7,7 +7,7 @@ class REST::AccountSerializer < ActiveModel::Serializer
   # Please update `app/javascript/mastodon/api_types/accounts.ts` when making changes to the attributes
 
   attributes :id, :username, :acct, :display_name, :locked, :bot, :discoverable, :indexable, :group, :created_at,
-             :note, :url, :uri, :avatar, :avatar_static, :header, :header_static,
+             :note, :url, :uri, :avatar, :avatar_static, :header, :header_static, :used_languages,
              :followers_count, :following_count, :statuses_count, :last_status_at, :hide_collections
 
   has_one :moved_to_account, key: :moved, serializer: REST::AccountSerializer, if: :moved_and_not_nested?