diff --git a/ext/or-tools/linear.cpp b/ext/or-tools/linear.cpp
index 8ebf163..52788d8 100644
--- a/ext/or-tools/linear.cpp
+++ b/ext/or-tools/linear.cpp
@@ -47,10 +47,10 @@ namespace Rice::detail
 void init_linear(Rice::Module& m) {
   Rice::define_class_under<LinearRange>(m, "LinearRange");
 
-  auto rb_cLinearExpr = Rice::define_class_under<LinearExpr>(m, "LinearExpr");
-  rb_cLinearExpr.define_constructor(Rice::Constructor<LinearExpr>());
+  // auto rb_cLinearExpr = Rice::define_class_under<LinearExpr>(m, "LinearExpr");
+  // rb_cLinearExpr.define_constructor(Rice::Constructor<LinearExpr>());
 
-  Rice::define_class_under<MPVariable, LinearExpr>(m, "MPVariable")
+  Rice::define_class_under<MPVariable>(m, "MPVariable")
     .define_method("name", &MPVariable::name)
     .define_method("solution_value", &MPVariable::solution_value);
 
diff --git a/test/linear_test.rb b/test/linear_test.rb
index b307072..5c0300f 100644
--- a/test/linear_test.rb
+++ b/test/linear_test.rb
@@ -65,7 +65,7 @@ def test_inspect
 
     assert_equal "#<ORTools::MPVariable x>", x.inspect
     assert_equal "#<ORTools::SumArray x + 1>", (x + 1).inspect
-    # assert_equal "#<ORTools::LinearExpr (empty)>", ORTools::LinearExpr.new.inspect
+    assert_equal "#<ORTools::LinearExpr (empty)>", ORTools::LinearExpr.new.inspect
     assert_equal "#<ORTools::LinearConstraint x + 1 == 1>", (x + 1 == 1).inspect
   end