diff --git a/Sources/VLSheetWindow.mm b/Sources/VLSheetWindow.mm
index ae13d6f..6aae776 100644
--- a/Sources/VLSheetWindow.mm
+++ b/Sources/VLSheetWindow.mm
@@ -93,6 +93,7 @@
     NSNotificationCenter * nc   = [NSNotificationCenter defaultCenter];
     [nc removeObserver:soundStartObserver];
     [nc removeObserver:soundStopObserver];
+    [super dealloc];
 }
 
 - (VLEditable *)editTarget