diff --git a/windows/JackWinMutex.h b/windows/JackWinMutex.h
index 86ebd22b..47d2d86a 100644
--- a/windows/JackWinMutex.h
+++ b/windows/JackWinMutex.h
@@ -20,7 +20,9 @@
 
 #ifndef __JackWinMutex__
 #define __JackWinMutex__
-
+
+#include "JackError.h"
+#include "JackException.h"
 #include <windows.h>
 
 namespace Jack
diff --git a/windows/JackWinNamedPipeServerChannel.cpp b/windows/JackWinNamedPipeServerChannel.cpp
index 194e68ac..328d2383 100644
--- a/windows/JackWinNamedPipeServerChannel.cpp
+++ b/windows/JackWinNamedPipeServerChannel.cpp
@@ -345,7 +345,6 @@ bool JackClientPipeThread::HandleRequest()
                 if (req.Read(fPipe) == 0) {
                     fServer->GetEngine()->SessionNotify(req.fRefNum, req.fDst, req.fEventType, req.fPath, fPipe, NULL);
                 }
-                res.Write(fPipe);
                 break;
             }
 
@@ -399,7 +398,7 @@ bool JackClientPipeThread::HandleRequest()
                 JackClientHasSessionCallbackRequest req;
                 JackResult res;
                 if (req.Read(fPipe) == 0) {
-                    fServer->GetEngine()->ClientHasSessionCallbackRequest(req.fName, &res.fResult);
+                    fServer->GetEngine()->ClientHasSessionCallback(req.fName, &res.fResult);
                 }
                 res.Write(fPipe);
                 break;
diff --git a/windows/winmme/JackWinMMEDriver.cpp b/windows/winmme/JackWinMMEDriver.cpp
index 02eb3433..eb6e6257 100644
--- a/windows/winmme/JackWinMMEDriver.cpp
+++ b/windows/winmme/JackWinMMEDriver.cpp
@@ -412,7 +412,7 @@ extern "C"
         // singleton kind of driver
         if (!driver) {
             driver = new Jack::JackWinMMEDriver("system_midi", "winmme", engine, table);
-            if (driver->Open(1, 1, virtual_in, virtual_out, false, "in", "out", 0, 0) == 0) {
+            if (driver->Open(1, 1, 0, 0, false, "in", "out", 0, 0) == 0) {
                 return driver;
             } else {
                 delete driver;