diff --git a/taglib/toolkit/tiostream.h b/taglib/toolkit/tiostream.h
index 571019a0..fe1ce673 100644
--- a/taglib/toolkit/tiostream.h
+++ b/taglib/toolkit/tiostream.h
@@ -28,15 +28,12 @@
 
 #include "tbytevector.h"
 
-#ifdef _WIN32
-# include "tstring.h"
-# include "tdebug.h"
-#endif
-
 namespace TagLib {
 
 #ifdef _WIN32
 
+  class String;
+
   class TAGLIB_EXPORT FileName
   {
   public: