diff --git a/include/wx/db.h b/include/wx/db.h
index 63ab1a66c7..9bd5f2ca00 100644
--- a/include/wx/db.h
+++ b/include/wx/db.h
@@ -77,7 +77,11 @@
         #include "wx/isqlext.h"
         // Not available in v2.x of iODBC
         #ifndef __WXMSW__
-            typedef wxChar SQLTCHAR;
+          #if wxUSE_UNICODE
+          typedef wxChar SQLTCHAR;
+          #else
+          typedef UCHAR SQLTCHAR;
+          #endif
         #endif
     #else
         #include <sql.h>