diff --git a/packager/react-packager/src/ModuleGraph/node-haste/Package.js b/packager/react-packager/src/ModuleGraph/node-haste/Package.js
index 861a15f23..ad328d7ab 100644
--- a/packager/react-packager/src/ModuleGraph/node-haste/Package.js
+++ b/packager/react-packager/src/ModuleGraph/node-haste/Package.js
@@ -77,7 +77,7 @@ module.exports = class Package {
 
       let relPath = './' + path.relative(this.root, name);
       if (path.sep !== '/') {
-        relPath = relPath.replace(path.sep, '/');
+        relPath = relPath.replace(new RegExp('\\' + path.sep, 'g'), '/');
       }
 
       let redirect = replacements[relPath];
diff --git a/packager/react-packager/src/node-haste/Package.js b/packager/react-packager/src/node-haste/Package.js
index 118e822c6..e77f9c22b 100644
--- a/packager/react-packager/src/node-haste/Package.js
+++ b/packager/react-packager/src/node-haste/Package.js
@@ -97,7 +97,7 @@ class Package {
 
       let relPath = './' + path.relative(this.root, name);
       if (path.sep !== '/') {
-        relPath = relPath.replace(path.sep, '/');
+        relPath = relPath.replace(new RegExp('\\' + path.sep, 'g'), '/');
       }
 
       let redirect = replacements[relPath];