diff --git a/Sources/KituraNet/IncomingSocketProcessor.swift b/Sources/KituraNet/IncomingSocketProcessor.swift
index 531dc43..d1abcf2 100644
--- a/Sources/KituraNet/IncomingSocketProcessor.swift
+++ b/Sources/KituraNet/IncomingSocketProcessor.swift
@@ -29,11 +29,7 @@ public protocol IncomingSocketProcessor: class {
 
     /// A back reference to the `IncomingSocketHandler` processing the socket that
     /// this `IncomingDataProcessor` is processing.
-    #if swift(>=4.1)
-        var handler: IncomingSocketHandler? { get set }
-    #else
-        weak var handler: IncomingSocketHandler? { get set }
-    #endif
+    var handler: IncomingSocketHandler? { get set }
 
     /// Process data read from the socket.
     ///