diff --git a/include/wx/os2/setup0.h b/include/wx/os2/setup0.h
index c957ac5b11..700bab6e27 100644
--- a/include/wx/os2/setup0.h
+++ b/include/wx/os2/setup0.h
@@ -391,6 +391,7 @@
                                   // DLL loading and function calling
 #define wxUSE_DYNAMIC_LOADER 0
 
+#define wxUSE_WCHAR_T           1
 #define wxUSE_PROTOCOL          1
 #define wxUSE_URL               1
 #define wxUSE_PROTOCOL_HTTP     1