diff --git a/types/react-native-snap-carousel/index.d.ts b/types/react-native-snap-carousel/index.d.ts
index dca8f53e9f..0679b4ac82 100644
--- a/types/react-native-snap-carousel/index.d.ts
+++ b/types/react-native-snap-carousel/index.d.ts
@@ -3,6 +3,7 @@
 // Definitions by: jnbt <https://github.com/jnbt>
 //                 Jacob Froman <https://github.com/j-fro>
 //                 Nikolay Polukhin <https://github.com/gazaret>
+//                 Guillaume Amat <https://github.com/GuillaumeAmat>
 //                 Vitor Luiz Cavalcanti <https://github.com/VitorLuizC>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.8
@@ -229,7 +230,7 @@ export interface CarouselProps<T> extends React.Props<ScrollViewProps> {
     /**
      * Used to define custom interpolations
      */
-    slideInterpolatedStyle?(animatedValue: number, carouselProps: CarouselProps<any>): StyleProp<ViewStyle>;
+    slideInterpolatedStyle?(index: number, animatedValue: Animated.AnimatedValue, carouselProps: CarouselProps<any>): StyleProp<ViewStyle>;
     /**
      * Optional style for each item's container (the one whose scale and opacity are animated)
      */