diff --git a/src/styles/withTheme.d.ts b/src/styles/withTheme.d.ts
index d14236dc084169..0409ca31dbf0fb 100644
--- a/src/styles/withTheme.d.ts
+++ b/src/styles/withTheme.d.ts
@@ -1,7 +1,5 @@
 import { Theme } from './createMuiTheme';
 
-interface withTheme<P = {}, T extends Theme = Theme> {
-  (component: React.ComponentType<P & { theme: T }>): React.ComponentClass<P>;
-}
-
-export default withTheme;
+export default function withTheme<P = {}, T extends Theme = Theme>(
+  component: React.ComponentType<P & { theme: T }>
+): React.ComponentClass<P>;