diff --git a/backend/schema/definitions.json b/backend/schema/definitions.json
index 4b4f3405..6e0cf6aa 100644
--- a/backend/schema/definitions.json
+++ b/backend/schema/definitions.json
@@ -172,7 +172,7 @@
       "description": "Domain Names separated by a comma",
       "example": "*.jc21.com,blog.jc21.com",
       "type": "array",
-      "maxItems": 15,
+      "maxItems": 30,
       "uniqueItems": true,
       "items": {
         "type": "string",
diff --git a/frontend/js/app/nginx/certificates/form.js b/frontend/js/app/nginx/certificates/form.js
index a56c3f8e..905e366d 100644
--- a/frontend/js/app/nginx/certificates/form.js
+++ b/frontend/js/app/nginx/certificates/form.js
@@ -265,7 +265,7 @@ module.exports = Mn.View.extend({
         this.ui.domain_names.selectize({
             delimiter:    ',',
             persist:      false,
-            maxOptions:   15,
+            maxOptions:   30,
             create:       function (input) {
                 return {
                     value: input,
diff --git a/frontend/js/app/nginx/dead/form.js b/frontend/js/app/nginx/dead/form.js
index 8f6774f6..18d11ae0 100644
--- a/frontend/js/app/nginx/dead/form.js
+++ b/frontend/js/app/nginx/dead/form.js
@@ -233,7 +233,7 @@ module.exports = Mn.View.extend({
         this.ui.domain_names.selectize({
             delimiter:    ',',
             persist:      false,
-            maxOptions:   15,
+            maxOptions:   30,
             create:       function (input) {
                 return {
                     value: input,
diff --git a/frontend/js/app/nginx/proxy/form.js b/frontend/js/app/nginx/proxy/form.js
index 1dfb5c18..98f64566 100644
--- a/frontend/js/app/nginx/proxy/form.js
+++ b/frontend/js/app/nginx/proxy/form.js
@@ -271,7 +271,7 @@ module.exports = Mn.View.extend({
         this.ui.domain_names.selectize({
             delimiter:    ',',
             persist:      false,
-            maxOptions:   15,
+            maxOptions:   30,
             create:       function (input) {
                 return {
                     value: input,
diff --git a/frontend/js/app/nginx/redirection/form.js b/frontend/js/app/nginx/redirection/form.js
index 1f81feeb..ef48ffd1 100644
--- a/frontend/js/app/nginx/redirection/form.js
+++ b/frontend/js/app/nginx/redirection/form.js
@@ -235,7 +235,7 @@ module.exports = Mn.View.extend({
         this.ui.domain_names.selectize({
             delimiter:    ',',
             persist:      false,
-            maxOptions:   15,
+            maxOptions:   30,
             create:       function (input) {
                 return {
                     value: input,