diff --git a/include/nana/gui/widgets/detail/tree_cont.hpp b/include/nana/gui/widgets/detail/tree_cont.hpp
index 2490ab95..d3993411 100644
--- a/include/nana/gui/widgets/detail/tree_cont.hpp
+++ b/include/nana/gui/widgets/detail/tree_cont.hpp
@@ -63,7 +63,7 @@ namespace detail
 			{
 				while (child)
 				{
-					if (child->owner == this)
+					if (child == this)
 						return true;
 
 					child = child->owner;