diff --git a/R/checkControl.R b/R/checkControl.R
index 09e5c21..59f9d5d 100644
--- a/R/checkControl.R
+++ b/R/checkControl.R
@@ -13,7 +13,7 @@ check.semtree.control <- function(control, fail = TRUE) {
   def.attr <- attributes(semtree.control())$names
   
   # add NULL-defaults
-  null_def <- c("min.N","min.bucket")
+  null_def <- c("min.N","min.bucket","strucchange.to")
   attr <- unique(c(attr, null_def))
   def.attr <- unique(c(def.attr, null_def))