diff --git a/dlib/cuda/tensor_tools.cpp b/dlib/cuda/tensor_tools.cpp
index 5c4f3bed4..fc78d73e7 100644
--- a/dlib/cuda/tensor_tools.cpp
+++ b/dlib/cuda/tensor_tools.cpp
@@ -687,7 +687,11 @@ namespace dlib { namespace tt
             tensor& beta_grad
     )
     {
+#ifdef DLIB_USE_CUDA
+        cuda::layer_normalize_gradient(eps, gradient_input, means, invstds, src, gamma, src_grad, gamma_grad, beta_grad);
+#else
         cpu::layer_normalize_gradient(eps, gradient_input, means, invstds, src, gamma, src_grad, gamma_grad, beta_grad);
+#endif
     }
 
 // ----------------------------------------------------------------------------------------