diff --git a/taglib/xm/xmfile.cpp b/taglib/xm/xmfile.cpp
index 313e6e77..61a554c8 100644
--- a/taglib/xm/xmfile.cpp
+++ b/taglib/xm/xmfile.cpp
@@ -35,6 +35,9 @@
 using namespace TagLib;
 using namespace XM;
 
+namespace
+{
+
 /*!
  * The Reader classes are helpers to make handling of the stripped XM
  * format more easy. In the stripped XM format certain header sizes might
@@ -343,6 +346,8 @@ private:
   List<Reader*> m_readers;
 };
 
+} // namespace
+
 class XM::File::FilePrivate
 {
 public: