diff --git a/react-mdl/index.d.ts b/react-mdl/index.d.ts
index b11c920dab..77a8045550 100644
--- a/react-mdl/index.d.ts
+++ b/react-mdl/index.d.ts
@@ -28,7 +28,7 @@ declare namespace __ReactMDL {
     interface MDLHTMLAttributes {
         // React-specific Attributes
         defaultChecked?: boolean;
-        defaultValue?: string | string[];
+        defaultValue?: number | string | string[];
 
         // Standard HTML Attributes
         accept?: string;