diff --git a/src/msw/main.cpp b/src/msw/main.cpp
index 900ef4fdef..796074690d 100644
--- a/src/msw/main.cpp
+++ b/src/msw/main.cpp
@@ -46,8 +46,10 @@
 #ifdef __WXWINCE__
     // there is no ExitProcess() under CE but exiting the main thread has the
     // same effect
+#ifndef ExitProcess
     #define ExitProcess ExitThread
 #endif
+#endif
 
 #ifdef __BORLANDC__
     // BC++ has to be special: its run-time expects the DLL entry point to be