diff --git a/src/Network/atc610x.cxx b/src/Network/atc610x.cxx
index 422ee1375..075c8f25d 100644
--- a/src/Network/atc610x.cxx
+++ b/src/Network/atc610x.cxx
@@ -198,7 +198,7 @@ void ATC610xSetLamp( int fd, int channel, bool value ) {
     buf[2] = 0;
     result = write( fd, buf, 2 );
     if ( result != 2 ) {
-        cout << "Write failed" << endl;
+        SG_LOG( SG_IO, SG_ALERT,  "Write failed" );
         exit( -1 );
     }
 }