diff --git a/include/wx/db.h b/include/wx/db.h
index 7ba5b74748..e5c4d1fed0 100644
--- a/include/wx/db.h
+++ b/include/wx/db.h
@@ -47,13 +47,14 @@
 	#ifdef __GNUG__
 	#pragma interface "db.h"
 	#endif
+	#include "wx/filefn.h"
 #endif
 
 #if defined(wx_msw) || defined(__WXMSW__) || defined(WIN32)
 #include <windows.h>
 #endif
 
-#ifdef _IODBC_
+#ifdef __UNIX__
 #if wxMAJOR_VERSION == 2
 	extern "C" {
 	#include "../../src/iodbc/isql.h"