diff --git a/include/wx/msw/curicop.h b/include/wx/msw/curicop.h
index 1ec5056e90..f2c70ccc1f 100644
--- a/include/wx/msw/curicop.h
+++ b/include/wx/msw/curicop.h
@@ -58,6 +58,6 @@ struct tagICONFILERES {
 
 typedef struct tagICONFILERES ICONFILERES;
 
-HANDLE ReadIcon( char *szFileName, int *W = 0, int *H = 0);
+HANDLE ReadIcon( wxChar *szFileName, int *W = 0, int *H = 0);
 HICON  MakeIcon( HANDLE hDIB, HINSTANCE hInst);