diff --git a/cadquery/occ_impl/sketch_solver.py b/cadquery/occ_impl/sketch_solver.py
index d57016c20..f59942c3e 100644
--- a/cadquery/occ_impl/sketch_solver.py
+++ b/cadquery/occ_impl/sketch_solver.py
@@ -160,7 +160,7 @@ def length_cost(x, t, x0, val):
     if t == "LINE":
         rv = norm(x[2:] - x[:2]) - val
     elif t == "CIRCLE":
-        rv = norm(x[2] * (x[4] - x[3])) - val
+        rv = norm(x[2] * x[4]) - val
     else:
         raise invalid_args(t)
 
diff --git a/tests/test_sketch.py b/tests/test_sketch.py
index 516ca430c..09846989d 100644
--- a/tests/test_sketch.py
+++ b/tests/test_sketch.py
@@ -449,8 +449,8 @@ def test_constraint_solver():
 
     assert s2._faces.isValid()
 
-    s2._tags["s1"][0].Length() == approx(0.5)
-    s2._tags["a1"][0].Length() == approx(1.0)
+    assert s2._tags["s1"][0].Length() == approx(0.5)
+    assert s2._tags["a1"][0].Length() == approx(1.0)
 
     s3 = (
         Sketch()