diff --git a/src/mlpack/methods/ann/layer/not_adapted/parametric_relu_impl.hpp b/src/mlpack/methods/ann/layer/not_adapted/parametric_relu_impl.hpp
index b23d169ceb..97ce441c09 100644
--- a/src/mlpack/methods/ann/layer/not_adapted/parametric_relu_impl.hpp
+++ b/src/mlpack/methods/ann/layer/not_adapted/parametric_relu_impl.hpp
@@ -12,8 +12,8 @@
  * 3-clause BSD license along with mlpack.  If not, see
  * http://www.opensource.org/licenses/BSD-3-Clause for more information.
  */
-#ifndef MLPACK_METHODS_ANN_LAYER_PReLU_IMPL_HPP
-#define MLPACK_METHODS_ANN_LAYER_PReLU_IMPL_HPP
+#ifndef MLPACK_METHODS_ANN_LAYER_PRELU_IMPL_HPP
+#define MLPACK_METHODS_ANN_LAYER_PRELU_IMPL_HPP
 
 // In case it hasn't yet been included.
 #include "parametric_relu.hpp"