diff --git a/packages/material-ui/src/Typography/Typography.d.ts b/packages/material-ui/src/Typography/Typography.d.ts
index 82624faf919edb..5dd162b279d310 100644
--- a/packages/material-ui/src/Typography/Typography.d.ts
+++ b/packages/material-ui/src/Typography/Typography.d.ts
@@ -30,6 +30,7 @@ export type TypographyClassKey =
   | 'body2'
   | 'caption'
   | 'button'
+  | 'overline'
   | 'srOnly'
   | 'alignLeft'
   | 'alignCenter'