diff --git a/react-packager/src/JSTransformer/index.js b/react-packager/src/JSTransformer/index.js
index 4f98d588..e3e713ee 100644
--- a/react-packager/src/JSTransformer/index.js
+++ b/react-packager/src/JSTransformer/index.js
@@ -40,7 +40,7 @@ var validateOpts = declareOpts({
   },
   transformModulePath: {
     type:'string',
-    required: true,
+    required: false,
   },
   nonPersistent: {
     type: 'boolean',
diff --git a/react-packager/src/Packager/index.js b/react-packager/src/Packager/index.js
index ddcab6ee..42295acc 100644
--- a/react-packager/src/Packager/index.js
+++ b/react-packager/src/Packager/index.js
@@ -42,7 +42,7 @@ var validateOpts = declareOpts({
   },
   transformModulePath: {
     type:'string',
-    required: true,
+    required: false,
   },
   nonPersistent: {
     type: 'boolean',
diff --git a/react-packager/src/Server/index.js b/react-packager/src/Server/index.js
index 1f5b7ff1..14b18c96 100644
--- a/react-packager/src/Server/index.js
+++ b/react-packager/src/Server/index.js
@@ -40,7 +40,7 @@ var validateOpts = declareOpts({
   },
   transformModulePath: {
     type:'string',
-    required: true,
+    required: false,
   },
   nonPersistent: {
     type: 'boolean',