diff --git a/DDG4/lcio/LCIOFileReader.cpp b/DDG4/lcio/LCIOFileReader.cpp
index 0ded547c40fb2e0df67dc3c52f6d88a2f0629dfe..69fd8c7ec63ef968496218fada7f2f7b8c7afa33 100644
--- a/DDG4/lcio/LCIOFileReader.cpp
+++ b/DDG4/lcio/LCIOFileReader.cpp
@@ -120,7 +120,7 @@ dd4hep::sim::LCIOFileReader::readParticleCollection(int /*event_number*/, EVENT:
     *particles = evt->getCollection(m_collectionName);
     if ( *particles ) {
       printout(INFO,"LCIOFileReader","read collection %s from event %d in run %d ", 
-               m_collectionName, evt->getEventNumber(), evt->getRunNumber());
+               m_collectionName.c_str(), evt->getEventNumber(), evt->getRunNumber());
       return EVENT_READER_OK;
     }
   }