diff --git a/Sources/Foundation/Stream.swift b/Sources/Foundation/Stream.swift
index f28bc9f511..37ba44a1d5 100644
--- a/Sources/Foundation/Stream.swift
+++ b/Sources/Foundation/Stream.swift
@@ -323,14 +323,15 @@ extension Stream {
 }
 #endif
 
-extension StreamDelegate {
-    func stream(_ aStream: Stream, handle eventCode: Stream.Event) { }
-}
 
 public protocol StreamDelegate : class {
     func stream(_ aStream: Stream, handle eventCode: Stream.Event)
 }
 
+extension StreamDelegate {
+    public func stream(_ aStream: Stream, handle eventCode: Stream.Event) { }
+}
+
 // MARK: -
 extension Stream.PropertyKey {
     public static let socketSecurityLevelKey = Stream.PropertyKey(rawValue: "kCFStreamPropertySocketSecurityLevel")