diff --git a/clientgui/BOINCGUIApp.cpp b/clientgui/BOINCGUIApp.cpp
index a7436c5549..3edd19018a 100644
--- a/clientgui/BOINCGUIApp.cpp
+++ b/clientgui/BOINCGUIApp.cpp
@@ -52,7 +52,10 @@ bool CBOINCGUIApp::OnInit()
     m_bBOINCStartedByManager = false;
     m_bFrameVisible = true;
     m_lBOINCCoreProcessId = 0;
+#ifdef __WXMSW__
     m_hBOINCCoreProcess = NULL;
+    m_hIdleDetectionDll = NULL;
+#endif
 
     // Enable Trace Masks
     //wxLog::AddTraceMask( wxT("Function Start/End") );
diff --git a/clientgui/BOINCGUIApp.h b/clientgui/BOINCGUIApp.h
index 49dd6bdba3..6742c94943 100644
--- a/clientgui/BOINCGUIApp.h
+++ b/clientgui/BOINCGUIApp.h
@@ -68,7 +68,7 @@ protected:
     bool            m_bBOINCStartedByManager;
     bool            m_bFrameVisible;
 
-    long            m_lBOINCCoreProcessId;
+    wxInt32         m_lBOINCCoreProcessId;
 
 #ifdef __WXMSW__
     HANDLE          m_hBOINCCoreProcess;