diff --git a/ivl.def b/ivl.def
index b6c571491..a0ec7613e 100644
--- a/ivl.def
+++ b/ivl.def
@@ -57,6 +57,7 @@ ivl_expr_repeat
 ivl_expr_scope
 ivl_expr_signal
 ivl_expr_signed
+ivl_expr_sized
 ivl_expr_string
 ivl_expr_uvalue
 ivl_expr_value