diff --git a/cpp/NonlinearConstraint-inl.h b/cpp/NonlinearConstraint-inl.h
index 0b59f6c19..b237081b9 100644
--- a/cpp/NonlinearConstraint-inl.h
+++ b/cpp/NonlinearConstraint-inl.h
@@ -25,7 +25,7 @@ template <class Config>
 NonlinearConstraint<Config>::NonlinearConstraint(const LagrangeKey& lagrange_key,
 					size_t dim_lagrange,
 					bool isEquality) :
-	NonlinearFactor<Config>(noiseModel::Constrained::All(dim_lagrange)),
+	NonlinearFactor<Config>(noiseModel::Unit::Create(dim_lagrange)),
 	lagrange_key_(lagrange_key), p_(dim_lagrange), isEquality_(isEquality) {
 	this->keys_.push_back(lagrange_key_);
 }
diff --git a/cpp/testNonlinearConstraint.cpp b/cpp/testNonlinearConstraint.cpp
index 86edf7809..5c59795e1 100644
--- a/cpp/testNonlinearConstraint.cpp
+++ b/cpp/testNonlinearConstraint.cpp
@@ -63,9 +63,13 @@ TEST( NonlinearConstraint1, unary_scalar_construction ) {
 	config.insert(x1, Vector_(1, 1.0));
 
 	// calculate the error
-	Vector actual = c1.unwhitenedError(config);
-	Vector expected = Vector_(1, -4.0);
-	CHECK(assert_equal(actual, expected, 1e-5));
+	Vector actualVec = c1.unwhitenedError(config);
+	Vector expectedVec = Vector_(1, -4.0);
+	CHECK(assert_equal(actualVec, expectedVec, 1e-5));
+
+	double actError = c1.error(config);
+	double expError = 8.0;
+	DOUBLES_EQUAL(expError, actError, 1e-5);
 }
 
 /* ************************************************************************* */