diff --git a/types/react-native-snap-carousel/index.d.ts b/types/react-native-snap-carousel/index.d.ts
index 1c5a749a87..d7b38c752e 100644
--- a/types/react-native-snap-carousel/index.d.ts
+++ b/types/react-native-snap-carousel/index.d.ts
@@ -297,7 +297,7 @@ export interface CarouselStatic<T> extends React.ComponentClass<CarouselProps<T>
      * (see #238). Note that the offset parameter is not required and will default to either 1 or -1 depending
      * on the current scroll position
      */
-    triggerRenderingHack(offset: number): void;
+    triggerRenderingHack(offset?: number): void;
 }
 
 export type CarouselProperties<T> = ScrollViewProps & CarouselProps<T> & React.Props<CarouselStatic<T>>;