diff --git a/PDFViewer/viewcontroller/ViewController.m b/PDFViewer/viewcontroller/ViewController.m
--- a/PDFViewer/viewcontroller/ViewController.m
+++ b/PDFViewer/viewcontroller/ViewController.m
@@ -28,7 +28,7 @@
 }
 
 - (void)viewDidDisappear {
-  [_pdfViewer stopSpeaking];
+  [_pdfViewer stopSpeaking:self];
 }
 
 - (void)setRepresentedObject:(id)representedObject {