diff --git a/types/react-native-material-kit/index.d.ts b/types/react-native-material-kit/index.d.ts
index 48c044a629..9c5531292b 100644
--- a/types/react-native-material-kit/index.d.ts
+++ b/types/react-native-material-kit/index.d.ts
@@ -281,7 +281,7 @@ export interface MKSwitchProperties extends TouchableWithoutFeedbackProps {
     thumbAniDuration?: number;
     rippleColor?: string;
     rippleAniDuration?: number;
-    onCheckedChange?(checked: boolean): void;
+    onCheckedChange?(opts: { checked: boolean }): void;
 }
 
 export interface MKIconToggleProperties extends MKRippleProperties, TouchableWithoutFeedbackProps {