diff --git a/types/bootstrap-fileinput/index.d.ts b/types/bootstrap-fileinput/index.d.ts
index 8a7df2dbbc..61a53b12bb 100644
--- a/types/bootstrap-fileinput/index.d.ts
+++ b/types/bootstrap-fileinput/index.d.ts
@@ -6,10 +6,14 @@
 
 /// <reference types="jquery" />
 
-interface JQuery {
-    fileinput: (options?: BootstrapFileInput.FileInputOptions) => JQuery;
-}
+export = BootstrapFileInput;
+export as namespace BootstrapFileInput;
 
+declare global {
+   interface JQuery {
+        fileinput: (options?: BootstrapFileInput.FileInputOptions) => JQuery;
+    }
+}
 
 declare module BootstrapFileInput {
     interface FileInputOptions {
@@ -19,6 +23,11 @@ declare module BootstrapFileInput {
         The locale JS file for the language code must be defined as mentioned in the translations section: http://plugins.krajee.com/file-input#translations
         */
         language?: string;
+
+        /**
+         * Theming
+         */
+        theme?: string;
         /**
         Whether to display the file caption.
         Defaults to true.