diff --git a/types/react-material-ui-form-validator/index.d.ts b/types/react-material-ui-form-validator/index.d.ts
index c54c1b9095..b8ad8ef550 100644
--- a/types/react-material-ui-form-validator/index.d.ts
+++ b/types/react-material-ui-form-validator/index.d.ts
@@ -10,7 +10,7 @@ import { TextFieldProps } from "material-ui";
 
 export interface ValidatorFormProps {
     className?: string;
-    onSubmit: (event: React.FormEventHandler) => void;
+    onSubmit: (event: React.FormEvent) => void;
     instantValidate?: boolean;
     onError?: (errors: any[]) => void;
     debounceTime?: number;
diff --git a/types/react-material-ui-form-validator/react-material-ui-form-validator-tests.tsx b/types/react-material-ui-form-validator/react-material-ui-form-validator-tests.tsx
index bf4b303502..df6dad47d7 100644
--- a/types/react-material-ui-form-validator/react-material-ui-form-validator-tests.tsx
+++ b/types/react-material-ui-form-validator/react-material-ui-form-validator-tests.tsx
@@ -6,7 +6,9 @@ import {
 } from 'react-material-ui-form-validator';
 
 class Test extends React.Component {
-    onSubmitted = (event: React.FormEventHandler) => {};
+    onSubmitted = (event: React.FormEvent) => {
+        event.preventDefault(); // Actually preventDefault() is called by ValidatorForm
+    }
     onError = (errors: any[]) => {};
     onValidate = (isValid: boolean) => {};