diff --git a/angular-formly/angular-formly.d.ts b/angular-formly/angular-formly.d.ts
index 423e6ff9b..e625f4d3e 100644
--- a/angular-formly/angular-formly.d.ts
+++ b/angular-formly/angular-formly.d.ts
@@ -198,7 +198,9 @@ declare module AngularFormly {
 		className?: string;
 
 
-		elementAttributes?: string;
+		elementAttributes?: {
+			[key: string]: string;
+		};
 
 
 		/**