diff --git a/index.d.ts b/index.d.ts
index 771afee..fcea064 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -1,25 +1,31 @@
 declare module 'react-native-circular-progress' {
   import * as React from 'react';
-  import { Animated, Easing, ViewPropTypes } from 'react-native';
+  import {
+    Animated,
+    Easing,
+    ViewPropTypes,
+    StyleProp,
+    ViewStyle
+  } from 'react-native';
 
   export interface AnimatedCircularProgressProps {
     /**
      * Width and height of circle
-     * 
+     *
      * @type {number | Animated.Value}
      */
     size: number | Animated.Value;
 
     /**
      * Thickness of the progress line
-     * 
+     *
      * @type {number}
      */
     width: number;
 
     /**
      * Thickness of background circle
-     * 
+     *
      * @type {number}
      * @default width
      */
@@ -27,7 +33,7 @@ declare module 'react-native-circular-progress' {
 
     /**
      * Current progress / fill
-     * 
+     *
      * @type {number}
      * @default 0
      */
@@ -35,7 +41,7 @@ declare module 'react-native-circular-progress' {
 
     /**
      * Color of the progress line
-     * 
+     *
      * @type {string}
      * @default 'black'
      */
@@ -43,14 +49,14 @@ declare module 'react-native-circular-progress' {
 
     /**
      * If unspecified, no background line will be rendered
-     * 
+     *
      * @type {string}
      */
     backgroundColor?: string;
 
     /**
      * Angle from which the progress starts from
-     * 
+     *
      * @type {number}
      * @default 90
      */
@@ -58,7 +64,7 @@ declare module 'react-native-circular-progress' {
 
     /**
      * Shape used at ends of progress line.
-     * 
+     *
      * @type {('butt' | 'round' | 'square')}
      * @default 'butt'
      */
@@ -66,7 +72,7 @@ declare module 'react-native-circular-progress' {
 
     /**
      * If you don't want a full circle, specify the arc angle
-     * 
+     *
      * @type {number}
      * @default 360
      */
@@ -74,14 +80,14 @@ declare module 'react-native-circular-progress' {
 
     /**
      * Style of the entire progress container
-     * 
+     *
      * @type {ViewPropTypes.style}
      */
-    style?: ViewPropTypes.style;
+    style?: StyleProp<ViewStyle>;
 
     /**
      * Pass a function as a child. It receiveds the current fill-value as an argument
-     * 
+     *
      * @type {Function}
      * @param {number} fill current fill-value
      * @return {JSX.Element} the element inside the circle
@@ -90,14 +96,14 @@ declare module 'react-native-circular-progress' {
 
     /**
      * Style of the children container
-     * 
+     *
      * @type {ViewPropTypes.style}
      */
-    childrenContainerStyle?: ViewPropTypes.style;
+    childrenContainerStyle?: StyleProp<ViewStyle>;
 
     /**
      * Initial fill-value before animation starts
-     * 
+     *
      * @type {number}
      * @default 0
      */
@@ -105,14 +111,14 @@ declare module 'react-native-circular-progress' {
 
     /**
      * Duration of animation in ms
-     * 
+     *
      * @type {number}
      * @default 500
      */
     duration?: number;
 
     /**
-     * 
+     *
      * @type {Function}
      * @default Easing.out(Easing.ease)
      */
@@ -120,29 +126,36 @@ declare module 'react-native-circular-progress' {
 
     /**
      * Function that's invoked when the animation completes (both on mount and if called with .animate())
-     * 
+     *
      */
-    onAnimationComplete?: () => void
+    onAnimationComplete?: (event: { finished: boolean }) => void;
   }
 
-  export class AnimatedCircularProgress extends React.Component<AnimatedCircularProgressProps> {
+  export class AnimatedCircularProgress extends React.Component<
+    AnimatedCircularProgressProps
+  > {
     /**
      * Animate the progress bar to a specific value
-     * 
-     * @param {number} toVal 
+     *
+     * @param {number} toVal
      * @param {number} duration
      * @param {Function} ease
      */
-    animate: (toVal: number, duration: number, ease?: Function) => void
+    animate: (toVal: number, duration: number, ease?: Function) => void;
 
     /**
      * Re-run animation with a specified prefill-value
-     * 
+     *
      * @param {number} prefill
      * @param {number} toVal
      * @param {number} duration
      * @param {Function} ease
      */
-    reAnimate: (prefill: number, toVal: number, duration: number, ease?: Function) => void
+    reAnimate: (
+      prefill: number,
+      toVal: number,
+      duration: number,
+      ease?: Function
+    ) => void;
   }
-}
\ No newline at end of file
+}