diff --git a/src/calls-ui-call-data.c b/src/calls-ui-call-data.c
index 0752bb7..490f0a1 100644
--- a/src/calls-ui-call-data.c
+++ b/src/calls-ui-call-data.c
@@ -402,7 +402,7 @@ on_delay_set_active (CallsUiCallData *self)
 }
 
 
-#define DELAY_UI_MS 15
+#define DELAY_UI_MS 100
 static void
 calls_ui_call_data_constructed (GObject *object)
 {
diff --git a/tests/test-ringer.c b/tests/test-ringer.c
index 3316513..19daf80 100644
--- a/tests/test-ringer.c
+++ b/tests/test-ringer.c
@@ -359,7 +359,7 @@ test_ringing_hang_up_call_ringer_cancelled (void **state)
   /** this timeout needs to be longer than the delay for activating the UI/ringer,
    * see DELAY_UI_MS in calls-ui-call-data.c
    */
-  g_timeout_add (20, G_SOURCE_FUNC (t3_on_ringer_timeout), data);
+  g_timeout_add (105, G_SOURCE_FUNC (t3_on_ringer_timeout), data);
 
   /* main loop will quit in t3_on_ringer_timeout() */
   g_main_loop_run (data->loop);