diff --git a/include/wx/msw/mslu.h b/include/wx/msw/mslu.h
index de23a77d01..348ef3e8a4 100644
--- a/include/wx/msw/mslu.h
+++ b/include/wx/msw/mslu.h
@@ -25,7 +25,7 @@ WXDLLIMPEXP_BASE bool wxUsingUnicowsDll();
 // Wrongly implemented functions from unicows.dll
 //------------------------------------------------------------------------
 
-#if !wxUSE_UNICODE_MSLU
+#if wxUSE_UNICODE_MSLU
 
 #if wxUSE_GUI
 
diff --git a/src/msw/mslu.cpp b/src/msw/mslu.cpp
index be45158331..eba45e13d7 100644
--- a/src/msw/mslu.cpp
+++ b/src/msw/mslu.cpp
@@ -23,6 +23,7 @@
 
 #ifndef WX_PRECOMP
     #include "wx/defs.h"
+    #include "wx/utils.h"
 #endif
 
 //------------------------------------------------------------------------