diff --git a/sections/legacy-event-initializers.txt b/sections/legacy-event-initializers.txt
index 8545fa7..f95cf0e 100644
--- a/sections/legacy-event-initializers.txt
+++ b/sections/legacy-event-initializers.txt
@@ -307,7 +307,7 @@ described in this Appendix.
 			undefined initCompositionEvent(DOMString typeArg,
 				optional boolean bubblesArg = false,
 				optional boolean cancelableArg = false,
-				optional WindowProxy? viewArg = null,
+				optional Window? viewArg = null,
 				optional DOMString dataArg = "");
 		};
 		</pre>