diff --git a/gtsam/nonlinear/expressions.h b/gtsam/nonlinear/expressions.h
index a549517e5..3e4664158 100644
--- a/gtsam/nonlinear/expressions.h
+++ b/gtsam/nonlinear/expressions.h
@@ -18,7 +18,7 @@ Expression<T> between(const Expression<T>& t1, const Expression<T>& t2) {
   return Expression<T>(traits<T>::Between, t1, t2);
 }
 
-typedef Expression<double> double_;
+//typedef Expression<double> double_;
 typedef Expression<Vector3> Vector3_;
 
 } // \namespace gtsam