diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorExecutor.h b/unsupported/Eigen/CXX11/src/Tensor/TensorExecutor.h
index 2f1acd321..1651bf4c3 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/TensorExecutor.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorExecutor.h
@@ -160,6 +160,7 @@ class TensorExecutor<Expression, ThreadPoolDevice, Vectorizable> {
 #else
       size_t num_threads = device.numThreads();
       if (num_threads > 1) {
+        cost = evaluator.costPerCoeff(Vectorizable)
         num_threads = TensorCostModel<ThreadPoolDevice>::numThreads(
             size, evaluator.costPerCoeff(Vectorizable), num_threads);
       }
@@ -183,7 +184,7 @@ class TensorExecutor<Expression, ThreadPoolDevice, Vectorizable> {
         }
         barrier.Wait();
       }
-#endif
+#endif  // defined(!EIGEN_USE_SIMPLE_THREAD_POOL)
     }
     evaluator.cleanup();
   }