diff --git a/src/calls-call-display.c b/src/calls-call-display.c
index d50c8e5..bf98958 100644
--- a/src/calls-call-display.c
+++ b/src/calls-call-display.c
@@ -263,6 +263,9 @@ call_state_changed_cb (CallsCallDisplay *self,
                                     select_mode_complete,
                                     NULL);
     break;
+
+  default:
+    g_assert_not_reached ();
   }
 
   /* Status text */
@@ -288,6 +291,9 @@ call_state_changed_cb (CallsCallDisplay *self,
   case CALLS_CALL_STATE_DISCONNECTED:
     stop_timeout (self);
     break;
+
+  default:
+    g_assert_not_reached ();
   }
 }