diff --git a/taglib/toolkit/tstring.h b/taglib/toolkit/tstring.h
index ab046d8e..57d5e503 100644
--- a/taglib/toolkit/tstring.h
+++ b/taglib/toolkit/tstring.h
@@ -41,7 +41,12 @@
  * \note consider conversion via usual char-by-char for loop to avoid UTF16->UTF8->UTF16
  * conversion happening in the background
  */
+
+#if QT_VERSION >= 0x040000
+#define QStringToTString(s) TagLib::String(s.toUtf8().data(), TagLib::String::UTF8)
+#else
 #define QStringToTString(s) TagLib::String(s.utf8().data(), TagLib::String::UTF8)
+#endif
 
 /*!
  * \relates TagLib::String
@@ -52,6 +57,7 @@
  * conversion happening in the background
  *
  */
+
 #define TStringToQString(s) QString::fromUtf8(s.toCString(true))
 
 namespace TagLib {