diff --git a/Libraries/StyleSheet/EdgeInsetsPropType.js b/Libraries/StyleSheet/EdgeInsetsPropType.js
index aa701cf7881e0b..9c38774478744b 100644
--- a/Libraries/StyleSheet/EdgeInsetsPropType.js
+++ b/Libraries/StyleSheet/EdgeInsetsPropType.js
@@ -22,11 +22,11 @@ const EdgeInsetsPropType = (createStrictShapeTypeChecker({
   right: PropTypes.number,
 }): ReactPropsCheckType & ReactPropsChainableTypeChecker);
 
-export type EdgeInsetsProp = {
-  top: number,
-  left: number,
-  bottom: number,
-  right: number,
-};
+export type EdgeInsetsProp = {|
+  +top: number,
+  +left: number,
+  +bottom: number,
+  +right: number,
+|};
 
 module.exports = EdgeInsetsPropType;