diff --git a/modules/highgui/src/cap_qtkit.mm b/modules/highgui/src/cap_qtkit.mm
index f2f7963aa..568e951fb 100644
--- a/modules/highgui/src/cap_qtkit.mm
+++ b/modules/highgui/src/cap_qtkit.mm
@@ -95,6 +95,8 @@ didDropVideoFrameWithSampleBuffer:(QTSampleBuffer *)sampleBuffer
 - (int)updateImage;
 - (IplImage*)getOutput;
 
+- (void)doFireTimer:(NSTimer *)timer;
+
 @end
 
 /*****************************************************************************
@@ -625,6 +627,11 @@ didDropVideoFrameWithSampleBuffer:(QTSampleBuffer *)sampleBuffer
     return 1;
 }
 
+- (void)doFireTimer:(NSTimer *)timer {
+    (void)timer;
+    // dummy
+}
+
 @end