diff --git a/ui/src/app/extension/extensions-forms/extension-form-opc.tpl.html b/ui/src/app/extension/extensions-forms/extension-form-opc.tpl.html
index 6d74cc5..3bcea1d 100644
--- a/ui/src/app/extension/extensions-forms/extension-form-opc.tpl.html
+++ b/ui/src/app/extension/extensions-forms/extension-form-opc.tpl.html
@@ -63,10 +63,7 @@
<md-input-container flex="50" class="md-block" md-is-error="theForm['applicationUri_' + serverIndex].$touched && theForm['applicationUri_' + serverIndex].$invalid">
<label translate>extension.opc-application-uri</label>
- <input required name="applicationUri_{{serverIndex}}" ng-model="server.applicationUri">
- <div ng-messages="theForm['applicationUri_' + serverIndex].$error">
- <div translate ng-message="required">extension.field-required</div>
- </div>
+ <input name="applicationUri_{{serverIndex}}" ng-model="server.applicationUri">
</md-input-container>
</div>
