diff --git a/packages/ra-core/src/i18n/translate.spec.js b/packages/ra-core/src/i18n/translate.spec.tsx
similarity index 59%
rename from packages/ra-core/src/i18n/translate.spec.js
rename to packages/ra-core/src/i18n/translate.spec.tsx
index c0e12cc7899..ae193e21c77 100644
--- a/packages/ra-core/src/i18n/translate.spec.js
+++ b/packages/ra-core/src/i18n/translate.spec.tsx
@@ -1,10 +1,14 @@
-import React from 'react';
+import React, { SFC } from 'react';
 
 import translate from './translate';
+import { TranslationContextProps } from './TranslationContext';
 
+interface Props extends TranslationContextProps {
+    foo: string;
+}
 describe('translate HOC', () => {
     it('should conserve base component default props', () => {
-        const Component = () => <div />;
+        const Component: SFC<Props> = () => <div />;
         Component.defaultProps = { foo: 'bar' };
 
         const TranslatedComponent = translate(Component);