diff --git a/test/api/v3/integration/groups/POST-groups_invite.test.js b/test/api/v3/integration/groups/POST-groups_invite.test.js
index 0001e09e3a..aab4c50a27 100644
--- a/test/api/v3/integration/groups/POST-groups_invite.test.js
+++ b/test/api/v3/integration/groups/POST-groups_invite.test.js
@@ -7,7 +7,7 @@ import {
 } from '../../../../helpers/api-integration/v3';
 
 const INVITES_LIMIT = 100;
-const PARTY_LIMIT_MEMBERS = 29;
+const PARTY_LIMIT_MEMBERS = 30;
 const MAX_EMAIL_INVITES_BY_USER = 200;
 
 describe('Post /groups/:groupId/invite', () => {
@@ -571,7 +571,7 @@ describe('Post /groups/:groupId/invite', () => {
         .to.eventually.be.rejected.and.eql({
           code: 400,
           error: 'BadRequest',
-          message: t('partyExceedsMembersLimit', { maxMembersParty: PARTY_LIMIT_MEMBERS + 1 }),
+          message: t('partyExceedsMembersLimit', { maxMembersParty: PARTY_LIMIT_MEMBERS }),
         });
     }).timeout(10000);
   });
diff --git a/website/common/script/constants.js b/website/common/script/constants.js
index b3510378e0..bc569da079 100644
--- a/website/common/script/constants.js
+++ b/website/common/script/constants.js
@@ -27,7 +27,7 @@ export const SUPPORTED_SOCIAL_NETWORKS = [
 
 export const GUILDS_PER_PAGE = 30; // number of guilds to return per page when using pagination
 
-export const PARTY_LIMIT_MEMBERS = 29;
+export const PARTY_LIMIT_MEMBERS = 30;
 
 export const MINIMUM_PASSWORD_LENGTH = 8;
 export const MAXIMUM_PASSWORD_LENGTH = 64;
diff --git a/website/server/models/group.js b/website/server/models/group.js
index c41aa0320b..6ca51cc955 100644
--- a/website/server/models/group.js
+++ b/website/server/models/group.js
@@ -414,7 +414,7 @@ function getInviteError (uuids, emails, usernames) {
   return errorString;
 }
 
-function getInviteCount (uuids, emails) {
+function getInviteCount (uuids, emails, usernames) {
   let totalInvites = 0;
 
   if (uuids) {
@@ -425,6 +425,10 @@ function getInviteCount (uuids, emails) {
     totalInvites += emails.length;
   }
 
+  if (usernames) {
+    totalInvites += usernames.length;
+  }
+
   return totalInvites;
 }
 
@@ -445,7 +449,7 @@ schema.statics.validateInvitations = async function getInvitationErr (invites, r
   const errorString = getInviteError(uuids, emails, usernames);
   if (errorString) throw new BadRequest(res.t(errorString));
 
-  const totalInvites = getInviteCount(uuids, emails);
+  const totalInvites = getInviteCount(uuids, emails, usernames);
   if (totalInvites > INVITES_LIMIT) {
     throw new BadRequest(res.t('canOnlyInviteMaxInvites', { maxInvites: INVITES_LIMIT }));
   }
@@ -471,7 +475,7 @@ schema.statics.validateInvitations = async function getInvitationErr (invites, r
     memberCount += totalInvites;
 
     if (memberCount > shared.constants.PARTY_LIMIT_MEMBERS) {
-      throw new BadRequest(res.t('partyExceedsMembersLimit', { maxMembersParty: shared.constants.PARTY_LIMIT_MEMBERS + 1 }));
+      throw new BadRequest(res.t('partyExceedsMembersLimit', { maxMembersParty: shared.constants.PARTY_LIMIT_MEMBERS }));
     }
   }
 };