diff --git a/types/react-is/react-is-tests.tsx b/types/react-is/react-is-tests.tsx
index 18ae0c4a26..3b41e9d06f 100644
--- a/types/react-is/react-is-tests.tsx
+++ b/types/react-is/react-is-tests.tsx
@@ -6,7 +6,7 @@ import * as ReactIs from 'react-is';
 // Determining if a Component is Valid
 
 interface CompProps {
-    forwardedRef?: React.Ref<any>;
+    forwardedRef: React.Ref<any> | null;
     children?: React.ReactNode;
 }
 
diff --git a/types/react/index.d.ts b/types/react/index.d.ts
index d554c8c2a9..89db73e581 100644
--- a/types/react/index.d.ts
+++ b/types/react/index.d.ts
@@ -463,7 +463,7 @@ declare namespace React {
     }
 
     interface RefForwardingComponent<T, P = {}> {
-        (props: P & { children?: ReactNode }, ref?: Ref<T>): ReactElement<any> | null;
+        (props: P & { children?: ReactNode }, ref: Ref<T> | null): ReactElement<any> | null;
         propTypes?: ValidationMap<P>;
         contextTypes?: ValidationMap<any>;
         defaultProps?: Partial<P>;