diff --git a/src/WireMock.Net/Owin/WireMockMiddleware.cs b/src/WireMock.Net/Owin/WireMockMiddleware.cs
index 1c4d8dee..4f67ccce 100644
--- a/src/WireMock.Net/Owin/WireMockMiddleware.cs
+++ b/src/WireMock.Net/Owin/WireMockMiddleware.cs
@@ -60,7 +60,7 @@ namespace WireMock.Owin
         public Task Invoke(IContext ctx)
 #endif
         {
-            if (_options.HandleRequestsSynchronously.GetValueOrDefault(true))
+            if (_options.HandleRequestsSynchronously.GetValueOrDefault(false))
             {
                 lock (_lock)
                 {