diff --git a/dix/events.c b/dix/events.c
index c085a75f3..aecf72686 100644
--- a/dix/events.c
+++ b/dix/events.c
@@ -2494,7 +2494,9 @@ DeliverDeviceEvents(WindowPtr pWin, InternalEvent *event, GrabPtr grab,
                                                        filter, grab);
                     if (deliveries > 0)
                         goto unwind;
-                }
+                } else if (rc != BadMatch)
+                    ErrorF("[dix] %s: XI conversion failed in DDE (%d, %d). Skipping delivery.\n",
+                            dev->name, event->any.type, rc);
             }
 
             /* Core event */
@@ -2510,7 +2512,9 @@ DeliverDeviceEvents(WindowPtr pWin, InternalEvent *event, GrabPtr grab,
                             filter, grab);
                     if (deliveries > 0)
                         goto unwind;
-                }
+                } else if (rc != BadMatch)
+                        ErrorF("[dix] %s: Core conversion failed in DDE (%d, %d).\n",
+                                dev->name, event->any.type, rc);
             }
 
             if ((deliveries < 0) || (pWin == stopAt) ||
@@ -3794,7 +3798,9 @@ DeliverFocusedEvent(DeviceIntPtr keybd, InternalEvent *event, WindowPtr window)
             deliveries = DeliverEventsToWindow(keybd, focus, &core, 1,
                                                GetEventFilter(keybd, &core),
                                                NullGrab);
-        }
+        } else if (rc != BadMatch)
+            ErrorF("[dix] %s: core conversion failed DFE (%d, %d). Skipping delivery.\n",
+                    keybd->name, event->any.type, rc);
     }
 
 unwind: