diff --git a/types/react-native-scrollable-tab-view/index.d.ts b/types/react-native-scrollable-tab-view/index.d.ts
index 8e2d227fc0..4cc4d674bb 100644
--- a/types/react-native-scrollable-tab-view/index.d.ts
+++ b/types/react-native-scrollable-tab-view/index.d.ts
@@ -140,7 +140,7 @@ export interface DefaultTabBarProps {
 }
 
 export type RenderTabProperties =
-    (name: string, pageIndex: number, isTabActive: boolean, onPressHandler: (pageNumber: number) => void, onLayoutHandler: (event: LayoutChangeEvent) => void) => JSX.Element;
+    (name: string, pageIndex: number, isTabActive: boolean, onPressHandler: (pageNumber: number) => void, onLayoutHandler?: (event: LayoutChangeEvent) => void) => JSX.Element;
 
 export class DefaultTabBar extends React.Component<TabBarProps<DefaultTabBarProps>> {
 }