diff --git a/include/media/Visualizer.h b/include/media/Visualizer.h
index b92f816..186e018 100644
--- a/include/media/Visualizer.h
+++ b/include/media/Visualizer.h
@@ -95,7 +95,8 @@
 
     // install a callback to receive periodic captures. The capture rate is specified in milliHertz
     // and the capture format is according to flags  (see callback_flags).
-    status_t setCaptureCallBack(capture_cbk_t cbk, void* user, uint32_t flags, uint32_t rate);
+    status_t setCaptureCallBack(capture_cbk_t cbk, void* user, uint32_t flags, uint32_t rate,
+                                bool force = false);
 
     // set the capture size capture size must be a power of two in the range
     // [VISUALIZER_CAPTURE_SIZE_MAX. VISUALIZER_CAPTURE_SIZE_MIN]