diff --git a/ios/CodePush/CodePush.h b/ios/CodePush/CodePush.h
index bd7db3c..1760715 100644
--- a/ios/CodePush/CodePush.h
+++ b/ios/CodePush/CodePush.h
@@ -70,6 +70,7 @@ failCallback:(void (^)(NSError *err))failCallback;
 @interface CodePushPackage : NSObject
 
 + (void)downloadPackage:(NSDictionary *)updatePackage
+ expectedBundleFileName:(NSString *)expectedBundleFileName
        progressCallback:(void (^)(long long, long long))progressCallback
            doneCallback:(void (^)())doneCallback
            failCallback:(void (^)(NSError *err))failCallback;
@@ -113,6 +114,7 @@ failCallback:(void (^)(NSError *err))failCallback;
                       error:(NSError **)error;
 
 + (NSString *)findMainBundleInFolder:(NSString *)folderPath
+                    expectedFileName:(NSString *)expectedFileName
                                error:(NSError **)error;
 
 + (NSString *)assetsFolderName;
diff --git a/ios/CodePush/CodePush.m b/ios/CodePush/CodePush.m
index 68141c6..d016e8d 100644
--- a/ios/CodePush/CodePush.m
+++ b/ios/CodePush/CodePush.m
@@ -419,7 +419,9 @@ RCT_EXPORT_METHOD(downloadUpdate:(NSDictionary*)updatePackage
                                 forKey:BinaryBundleDateKey];
     }
     
-    [CodePushPackage downloadPackage:mutableUpdatePackage
+    [CodePushPackage
+        downloadPackage:mutableUpdatePackage
+        expectedBundleFileName:[bundleResourceName stringByAppendingPathExtension:bundleResourceExtension]
         // The download is progressing forward
         progressCallback:^(long long expectedContentLength, long long receivedContentLength) {
             dispatch_async(_methodQueue, ^{
diff --git a/ios/CodePush/CodePushPackage.m b/ios/CodePush/CodePushPackage.m
index 9699f09..979bd34 100644
--- a/ios/CodePush/CodePushPackage.m
+++ b/ios/CodePush/CodePushPackage.m
@@ -205,6 +205,7 @@ NSString * const UnzippedFolderName = @"unzipped";
 }
 
 + (void)downloadPackage:(NSDictionary *)updatePackage
+ expectedBundleFileName:(NSString *)expectedBundleFileName
        progressCallback:(void (^)(long long, long long))progressCallback
            doneCallback:(void (^)())doneCallback
            failCallback:(void (^)(NSError *err))failCallback
@@ -360,7 +361,9 @@ NSString * const UnzippedFolderName = @"unzipped";
                 }
                 
                 NSString *relativeBundlePath = [CodePushUpdateUtils findMainBundleInFolder:newUpdateFolderPath
+                                                                          expectedFileName:expectedBundleFileName
                                                                                      error:&error];
+                
                 if (error) {
                     failCallback(error);
                     return;
diff --git a/ios/CodePush/CodePushUpdateUtils.m b/ios/CodePush/CodePushUpdateUtils.m
index 29c199f..ca541f7 100644
--- a/ios/CodePush/CodePushUpdateUtils.m
+++ b/ios/CodePush/CodePushUpdateUtils.m
@@ -118,6 +118,7 @@ NSString * const ManifestFolderPrefix = @"CodePush";
 }
 
 + (NSString *)findMainBundleInFolder:(NSString *)folderPath
+                    expectedFileName:(NSString *)expectedFileName
                                error:(NSError **)error
 {
     NSArray* folderFiles = [[NSFileManager defaultManager]
@@ -132,7 +133,9 @@ NSString * const ManifestFolderPrefix = @"CodePush";
         BOOL isDir = NO;
         if ([[NSFileManager defaultManager] fileExistsAtPath:fullFilePath
                                                  isDirectory:&isDir] && isDir) {
-            NSString *mainBundlePathInFolder = [self findMainBundleInFolder:fullFilePath error:error];
+            NSString *mainBundlePathInFolder = [self findMainBundleInFolder:fullFilePath
+                                                           expectedFileName:expectedFileName
+                                                                      error:error];
             if (*error) {
                 return nil;
             }
@@ -140,9 +143,7 @@ NSString * const ManifestFolderPrefix = @"CodePush";
             if (mainBundlePathInFolder) {
                 return [fileName stringByAppendingPathComponent:mainBundlePathInFolder];
             }
-        } else if ([[fileName pathExtension] isEqualToString:@"bundle"] ||
-                   [[fileName pathExtension] isEqualToString:@"jsbundle"] ||
-                   [[fileName pathExtension] isEqualToString:@"js"]) {
+        } else if ([fileName isEqualToString:expectedFileName]) {
             return fileName;
         }
     }