diff --git a/gaphas/item.py b/gaphas/item.py
index 9fdafa66..119515dc 100644
--- a/gaphas/item.py
+++ b/gaphas/item.py
@@ -293,7 +293,7 @@ def update_orthogonal_constraints(self) -> None:
             self._connections.remove_constraint(self, c)
         del self._orthogonal_constraints[:]
 
-        if not self._orthogonal or len(self._handles) < 3:
+        if not self.orthogonal or len(self._handles) < 3:
             return
 
         add = self._connections.add_constraint
diff --git a/pyproject.toml b/pyproject.toml
index 273bf1d7..5d556f96 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "gaphas"
-version = "3.10.0"
+version = "3.10.1"
 description="Gaphas is a GTK+ based diagramming widget"
 authors = [
     "Arjan J. Molenaar <gaphor@gmail.com>",