diff --git a/Sources/Bluetooth/L2CAPSocket.swift b/Sources/Bluetooth/L2CAPSocket.swift
index dd30904d3..f9a3baffa 100644
--- a/Sources/Bluetooth/L2CAPSocket.swift
+++ b/Sources/Bluetooth/L2CAPSocket.swift
@@ -6,12 +6,12 @@
 //  Copyright © 2018 PureSwift. All rights reserved.
 //
 
-#if canImport(Foundation)
-import Foundation
-
+#if !hasFeature(Embedded)
 /// L2CAP Socket protocol.
 public protocol L2CAPSocket {
     
+    associatedtype Data: DataContainer
+    
     /// Socket address
     var address: BluetoothAddress { get }
     
@@ -76,5 +76,4 @@ public enum L2CAPSocketEvent {
 }
 
 public typealias L2CAPSocketEventStream = AsyncStream<L2CAPSocketEvent>
-
-#endif
\ No newline at end of file
+#endif