diff --git a/Horizontal.py b/Horizontal.py
index 5d73b94..e8e35d5 100644
--- a/Horizontal.py
+++ b/Horizontal.py
@@ -9,8 +9,8 @@ class Horizontal(Constraint):
         self.pt2 = pt2
 
     def toEqu(self):
-        varrefs1 = self.shape1.toEqu(pt1)[1]
-        varrefs2 = self.shape2.toEqu(pt2)[1]
+        varrefs1 = self.shape1.toEqu(self.pt1)[1]
+        varrefs2 = self.shape2.toEqu(self.pt2)[1]
         coeffs = []
         for i in range(len(varrefs1)):
             coeffs.append((1 * varrefs1[i], (self.shape1, i)))
diff --git a/Vertical.py b/Vertical.py
index ad0dfaa..0b4e92d 100644
--- a/Vertical.py
+++ b/Vertical.py
@@ -9,8 +9,8 @@ class Vertical(Constraint):
         self.pt2 = pt2
 
     def toEqu(self):
-        varrefs1 = self.shape1.toEqu(pt1)[0]
-        varrefs2 = self.shape2.toEqu(pt2)[0]
+        varrefs1 = self.shape1.toEqu(self.pt1)[0]
+        varrefs2 = self.shape2.toEqu(self.pt2)[0]
         coeffs = []
         for i in range(len(varrefs1)):
             coeffs.append((1 * varrefs1[i], (self.shape1, i)))