diff --git a/unsupported/Eigen/CXX11/src/Tensor/TensorReductionCuda.h b/unsupported/Eigen/CXX11/src/Tensor/TensorReductionCuda.h
index f9ce24373..45087a9a4 100644
--- a/unsupported/Eigen/CXX11/src/Tensor/TensorReductionCuda.h
+++ b/unsupported/Eigen/CXX11/src/Tensor/TensorReductionCuda.h
@@ -530,6 +530,7 @@ template <typename Self, typename Op>
 struct InnerReductionLauncher<Self, Op, Eigen::half, false> {
   static bool run(const Self&, Op&, const GpuDevice&, half*, typename Self::Index, typename Self::Index) {
     assert(false && "Should not be called since there is no packet accessor");
+    return true;
   }
 };