diff --git a/scm-ui/ui-types/src/User.ts b/scm-ui/ui-types/src/User.ts
index 810a944017..fd2314144b 100644
--- a/scm-ui/ui-types/src/User.ts
+++ b/scm-ui/ui-types/src/User.ts
@@ -39,6 +39,6 @@ export type User = {
   type?: string;
   creationDate?: string;
   lastModified?: string;
-  external?: boolean;
+  external: boolean;
   _links: Links;
 };
diff --git a/scm-ui/ui-webapp/src/users/components/UserForm.tsx b/scm-ui/ui-webapp/src/users/components/UserForm.tsx
index 62c29b00bc..fcc91c188f 100644
--- a/scm-ui/ui-webapp/src/users/components/UserForm.tsx
+++ b/scm-ui/ui-webapp/src/users/components/UserForm.tsx
@@ -186,7 +186,7 @@ class UserForm extends React.Component<Props, State> {
                   <Checkbox
                     label={t("user.externalFlag")}
                     onChange={this.handleExternalChange}
-                    checked={!!user.external}
+                    checked={user.external}
                     helpText={t("help.externalFlagHelpText")}
                   />
                 </div>