Index: src/Concurrency/Waitfor.cpp
===================================================================
--- src/Concurrency/Waitfor.cpp	(revision db19e1d0d4adcc296ca7022c295f441155d4b6dc)
+++ src/Concurrency/Waitfor.cpp	(revision aa14aafea1bae6cc4de02b4744e9d067c47d6d05)
@@ -230,5 +230,6 @@
 			ast::ConstantExpr::from_int( location, 0 ),
 			new ast::SizeofExpr( location,
-				new ast::VariableExpr( location, acceptables ) ),
+				new ast::TypeofType(
+					new ast::VariableExpr( location, acceptables ) ) ),
 		}
 	);