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--- a/src/avtransport.cxx
+++ b/src/avtransport.cxx
@@ -390,7 +390,7 @@
     UpSong metaformpd;
     if (!m_dev->checkContentFormat(uri, metadata, &metaformpd)) {
         LOGERR("set(Next)AVTransportURI: unsupported format: uri " << uri <<
-               " metadata " << metadata);
+               " metadata [" << metadata << "]\n");
         return UPNP_E_INVALID_PARAM;
     }