diff --git a/taglib/mpeg/mpegfile.cpp b/taglib/mpeg/mpegfile.cpp
index 6fbbf19e..23eeeb5e 100644
--- a/taglib/mpeg/mpegfile.cpp
+++ b/taglib/mpeg/mpegfile.cpp
@@ -65,7 +65,7 @@ namespace
 class MPEG::File::FilePrivate
 {
 public:
-  FilePrivate(ID3v2::FrameFactory *frameFactory = ID3v2::FrameFactory::instance()) :
+  FilePrivate(const ID3v2::FrameFactory *frameFactory = ID3v2::FrameFactory::instance()) :
     ID3v2FrameFactory(frameFactory),
     ID3v2Location(-1),
     ID3v2OriginalSize(0),