diff --git a/Eigen/src/plugins/MatrixCwiseUnaryOps.h b/Eigen/src/plugins/MatrixCwiseUnaryOps.h
index f95c0fe29..a3d9a0e14 100644
--- a/Eigen/src/plugins/MatrixCwiseUnaryOps.h
+++ b/Eigen/src/plugins/MatrixCwiseUnaryOps.h
@@ -77,6 +77,6 @@ cwiseInverse() const { return derived(); }
 inline const CwiseUnaryOp<std::binder1st<std::equal_to<Scalar> >, const Derived>
 cwiseEqual(const Scalar& s) const
 {
-  return CwiseUnaryOp<std::binder1st<std::equal_to<Scalar> >,Derived>
+  return CwiseUnaryOp<std::binder1st<std::equal_to<Scalar> >,const Derived>
           (derived(), std::bind1st(std::equal_to<Scalar>(), s));
 }