diff --git a/drivers/lance/lance.c b/drivers/lance/lance.c
index a09940b6a..c9637d100 100644
--- a/drivers/lance/lance.c
+++ b/drivers/lance/lance.c
@@ -391,6 +391,8 @@ void main( int argc, char **argv )
               }
           }
         break;
+      case PROC_EVENT:
+	break;
       default:
         panic( "lance", "illegal message", m.m_type);
       }
diff --git a/drivers/printer/printer.c b/drivers/printer/printer.c
index 614326c07..326ce1215 100644
--- a/drivers/printer/printer.c
+++ b/drivers/printer/printer.c
@@ -143,6 +143,7 @@ PUBLIC void main(void)
 	    case HARD_INT:	do_printer_output();	break;
 	    case SYS_SIG:	do_signal(&pr_mess); 	break;
 	    case DEV_PING:  	notify(pr_mess.m_source);	break;
+	    case PROC_EVENT:	break;
 	    default:
 		reply(TASK_REPLY, pr_mess.m_source, pr_mess.IO_ENDPT, EINVAL);
 	}