diff --git a/clientgui/BOINCGUIApp.cpp b/clientgui/BOINCGUIApp.cpp
index 526af09b58..23a7599ae6 100644
--- a/clientgui/BOINCGUIApp.cpp
+++ b/clientgui/BOINCGUIApp.cpp
@@ -1103,7 +1103,7 @@ int CBOINCGUIApp::ConfirmExit() {
     dlg.Centre();
 
     if (wxID_OK == dlg.ShowModal()) {
-#ifndef __WXMAC__
+#ifdef __WXMAC__
         s_bSkipExitConfirmation = true;     // Don't ask twice (only affects Mac)
 #else
         m_iShutdownCoreClient = dlg.m_DialogShutdownCoreClient->GetValue();