diff --git a/types/react-navigation/index.d.ts b/types/react-navigation/index.d.ts
index 846ea56a9e..15e72b6b61 100644
--- a/types/react-navigation/index.d.ts
+++ b/types/react-navigation/index.d.ts
@@ -1248,17 +1248,17 @@ export interface NavigationInjectedProps<P = NavigationParams> {
 }
 
 // If the wrapped component is a class, we can get a ref to it
-export function withNavigation<T extends React.ComponentClass<NavigationInjectedProps>>(
-  Component: T,
-): React.ComponentType<Omit<InferProps<T>, keyof NavigationInjectedProps> & { onRef?: React.Ref<InstanceType<T>> }>;
+export function withNavigation<P extends NavigationInjectedProps, T extends React.ComponentClass<P>>(
+  Component: T & React.ComponentClass<P>,
+): React.ComponentType<Omit<P, keyof NavigationInjectedProps> & { onRef?: React.Ref<InstanceType<T>> }>;
 
-export function withNavigation<T extends React.ComponentType<NavigationInjectedProps>>(
-  Component: T,
-): React.ComponentType<Omit<InferProps<T>, keyof NavigationInjectedProps>>;
+export function withNavigation<P extends NavigationInjectedProps>(
+  Component: React.ComponentType<P>,
+): React.ComponentType<Omit<P, keyof NavigationInjectedProps>>;
 
 // For backwards compatibility
 export function withNavigation<T = {}, P = NavigationParams>(
-  Component: React.ComponentType<T | (T & NavigationInjectedProps<P>)>,
+  Component: React.ComponentType<T & NavigationInjectedProps<P>>,
 ): React.ComponentType<T & { onRef?: React.Ref<React.Component<T & NavigationInjectedProps<P>>> }>;
 
 export interface NavigationFocusInjectedProps<P = NavigationParams> extends NavigationInjectedProps<P> {
@@ -1266,13 +1266,13 @@ export interface NavigationFocusInjectedProps<P = NavigationParams> extends Navi
 }
 
 // If the wrapped component is a class, we can get a ref to it
-export function withNavigationFocus<T extends React.ComponentClass<NavigationFocusInjectedProps>>(
-  Component: T,
-): React.ComponentType<Omit<InferProps<T>, keyof NavigationFocusInjectedProps> & { onRef?: React.Ref<InstanceType<T>> }>;
+export function withNavigationFocus<P extends NavigationFocusInjectedProps, T extends React.ComponentClass<P>>(
+  Component: T & React.ComponentClass<P>,
+): React.ComponentType<Omit<P, keyof NavigationFocusInjectedProps> & { onRef?: React.Ref<InstanceType<T>> }>;
 
-export function withNavigationFocus<T extends React.ComponentType<NavigationFocusInjectedProps>>(
-  Component: T,
-): React.ComponentType<Omit<InferProps<T>, keyof NavigationFocusInjectedProps>>;
+export function withNavigationFocus<P extends NavigationFocusInjectedProps>(
+  Component: React.ComponentType<P>,
+): React.ComponentType<Omit<P, keyof NavigationFocusInjectedProps>>;
 
 // For backwards compatibility
 export function withNavigationFocus<T = {}, P = NavigationParams>(
diff --git a/types/react-navigation/react-navigation-tests.tsx b/types/react-navigation/react-navigation-tests.tsx
index e568fbed27..ba77442a40 100644
--- a/types/react-navigation/react-navigation-tests.tsx
+++ b/types/react-navigation/react-navigation-tests.tsx
@@ -383,14 +383,14 @@ class CustomTransitioner extends React.Component<CustomTransitionerProps, null>
             />
         );
     }
-    _render = (props: NavigationTransitionProps, prevProps: NavigationTransitionProps): React.ReactElement<any> => {
+    _render = (props: NavigationTransitionProps, prevProps?: NavigationTransitionProps): React.ReactElement<any> => {
         return (
             <View />
         );
     }
     _configureTransition = (
         _transitionProps: NavigationTransitionProps,
-        _prevTransitionProps: NavigationTransitionProps
+        _prevTransitionProps?: NavigationTransitionProps
     ) => {
         return {};
     }
diff --git a/types/react-navigation/tsconfig.json b/types/react-navigation/tsconfig.json
index b0cf7029db..bc49bee237 100644
--- a/types/react-navigation/tsconfig.json
+++ b/types/react-navigation/tsconfig.json
@@ -7,7 +7,7 @@
         "noImplicitAny": true,
         "noImplicitThis": true,
         "strictNullChecks": true,
-        "strictFunctionTypes": false,
+        "strictFunctionTypes": true,
         "baseUrl": "../",
         "jsx": "react",
         "typeRoots": [