diff --git a/modules/videoio/src/cap_qtkit.mm b/modules/videoio/src/cap_qtkit.mm
index bdbbd2d1e4..ad6037b766 100644
--- a/modules/videoio/src/cap_qtkit.mm
+++ b/modules/videoio/src/cap_qtkit.mm
@@ -93,6 +93,8 @@ didDropVideoFrameWithSampleBuffer:(QTSampleBuffer *)sampleBuffer
 - (int)updateImage;
 - (IplImage*)getOutput;
 
+- (void)doFireTimer:(NSTimer *)timer;
+
 @end
 
 /*****************************************************************************
@@ -622,6 +624,11 @@ didDropVideoFrameWithSampleBuffer:(QTSampleBuffer *)sampleBuffer
     return 1;
 }
 
+- (void)doFireTimer:(NSTimer *)timer {
+    (void)timer;
+    // dummy
+}
+
 @end