diff --git a/hw/char/terminal3270.c b/hw/char/terminal3270.c
index 6859c1bcb2..2aab04fd4b 100644
--- a/hw/char/terminal3270.c
+++ b/hw/char/terminal3270.c
@@ -166,6 +166,11 @@ static void chr_event(void *opaque, int event)
         sch->curr_status.scsw.dstat = SCSW_DSTAT_DEVICE_END;
         css_conditional_io_interrupt(sch);
         break;
+    case CHR_EVENT_BREAK:
+    case CHR_EVENT_MUX_IN:
+    case CHR_EVENT_MUX_OUT:
+        /* Ignore */
+        break;
     }
 }