diff --git a/Horizontal.py b/Horizontal.py
index e8e35d5..7813806 100644
--- a/Horizontal.py
+++ b/Horizontal.py
@@ -15,5 +15,5 @@ class Horizontal(Constraint):
         for i in range(len(varrefs1)):
             coeffs.append((1 * varrefs1[i], (self.shape1, i)))
         for i in range(len(varrefs2)):
-            coeffs.append((-1 * varrefs2[i], (self.shape2, i))
+            coeffs.append((-1 * varrefs2[i], (self.shape2, i)))
         return [(coeffs, 0)]
diff --git a/Vertical.py b/Vertical.py
index 0b4e92d..fe8edad 100644
--- a/Vertical.py
+++ b/Vertical.py
@@ -15,5 +15,5 @@ class Vertical(Constraint):
         for i in range(len(varrefs1)):
             coeffs.append((1 * varrefs1[i], (self.shape1, i)))
         for i in range(len(varrefs2)):
-            coeffs.append((-1 * varrefs2[i], (self.shape2, i))
+            coeffs.append((-1 * varrefs2[i], (self.shape2, i)))
         return [(coeffs, 0)]