diff --git a/ios/Classes/SwiftFlutterTwilioVoicePlugin.swift b/ios/Classes/SwiftFlutterTwilioVoicePlugin.swift
index 6e3df69..eb0b8bb 100644
--- a/ios/Classes/SwiftFlutterTwilioVoicePlugin.swift
+++ b/ios/Classes/SwiftFlutterTwilioVoicePlugin.swift
@@ -288,15 +288,15 @@ public class SwiftFlutterTwilioVoicePlugin: NSObject, FlutterPlugin,  FlutterStr
     
     func checkRecordPermission(completion: @escaping (_ permissionGranted: Bool) -> Void) {
         switch AVAudioSession.sharedInstance().recordPermission {
-        case AVAudioSessionRecordPermission.granted:
+        case AVAudioSession.RecordPermission.granted:
             // Record permission already granted.
             completion(true)
             break
-        case AVAudioSessionRecordPermission.denied:
+        case AVAudioSession.RecordPermission.denied:
             // Record permission denied.
             completion(false)
             break
-        case AVAudioSessionRecordPermission.undetermined:
+        case AVAudioSession.RecordPermission.undetermined:
             // Requesting record permission.
             // Optional: pop up app dialog to let the users know if they want to request.
             AVAudioSession.sharedInstance().requestRecordPermission({ (granted) in