diff --git a/internal/ceres/gradient_checker.cc b/internal/ceres/gradient_checker.cc
index f00c76e..411a67f 100644
--- a/internal/ceres/gradient_checker.cc
+++ b/internal/ceres/gradient_checker.cc
@@ -111,7 +111,7 @@
       Matrix global_J_local(global_size, local_size);
       local_parameterizations.at(i)->ComputeJacobian(
           parameters[i], global_J_local.data());
-      local_jacobians->at(i) = jacobians->at(i) * global_J_local;
+      local_jacobians->at(i).noalias() = jacobians->at(i) * global_J_local;
     }
   }
   return true;