diff --git a/mobservable-react/mobservable-react.d.ts b/mobservable-react/mobservable-react.d.ts
index f42627a85..e95fc69f5 100644
--- a/mobservable-react/mobservable-react.d.ts
+++ b/mobservable-react/mobservable-react.d.ts
@@ -10,7 +10,7 @@ declare module "mobservable-react" {
      * Turns a React component or stateless render function into a reactive component.
      */
     export function reactiveComponent<P>(clazz: React.ClassicComponentClass<P>): React.ClassicComponentClass<P>;
+    export function reactiveComponent<TFunction extends React.ComponentClass<any>>(target: TFunction): void; // decorator signature
     export function reactiveComponent<P>(clazz: React.ComponentClass<P>): React.ComponentClass<P>;
-    export function reactiveComponent<TFunction extends React.ComponentClass<any>>(target: TFunction): TFunction | void; // decorator signature
     export function reactiveComponent<P>(renderFunction: (props: P) => React.ReactElement<any>): React.ClassicComponentClass<P>;
 }
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