diff --git a/types/material-ui/index.d.ts b/types/material-ui/index.d.ts
index b6919280d3..24ce477dbe 100644
--- a/types/material-ui/index.d.ts
+++ b/types/material-ui/index.d.ts
@@ -627,6 +627,7 @@ declare namespace __MaterialUI {
     // non generally overridden elements of EnhancedButton
     interface SharedEnhancedButtonProps<T> {
         centerRipple?: boolean;
+        className?: string;
         disableFocusRipple?: boolean;
         disableKeyboardFocus?: boolean;
         disableTouchRipple?: boolean;