diff --git a/src/Foundation/NSUrlSessionHandler.cs b/src/Foundation/NSUrlSessionHandler.cs
index 589c52efd8cd..fcc432dbbd59 100644
--- a/src/Foundation/NSUrlSessionHandler.cs
+++ b/src/Foundation/NSUrlSessionHandler.cs
@@ -293,6 +293,7 @@ protected override void Dispose (bool disposing)
 
 				inflightRequests.Clear ();
 			}
+			session.InvalidateAndCancel ();
 			base.Dispose (disposing);
 		}
 
@@ -449,6 +450,7 @@ public bool UseCookies {
 					configuration.HttpCookieStorage = null;
 				}
 				session = NSUrlSession.FromConfiguration (configuration, (INSUrlSessionDelegate) new NSUrlSessionHandlerDelegate (this), null);
+				oldSession.FinishTasksAndInvalidate ();
 				oldSession.Dispose ();
 			}
 		}