diff --git a/Signals/Signal.swift b/Signals/Signal.swift
index 9806c90..95fc7a3 100644
--- a/Signals/Signal.swift
+++ b/Signals/Signal.swift
@@ -32,11 +32,9 @@ final public class Signal<T> {
     /// All the observers of to the `Signal`.
     public var observers:[AnyObject] {
         get {
-            return signalListeners.filter {
-                return $0.observer != nil
-                }.map {
-                    (signal) -> AnyObject in
-                    return signal.observer!
+            return signalListeners.compactMap {
+                (signal) -> AnyObject? in
+                return signal.observer
             }
         }
     }