diff --git a/src/mlpack/core/optimizers/ada_delta/ada_delta_impl.hpp b/src/mlpack/core/optimizers/ada_delta/ada_delta_impl.hpp
index ef026e6e58..ab1dfa5099 100644
--- a/src/mlpack/core/optimizers/ada_delta/ada_delta_impl.hpp
+++ b/src/mlpack/core/optimizers/ada_delta/ada_delta_impl.hpp
@@ -21,12 +21,12 @@ namespace optimization {
 
 template<typename DecomposableFunctionType>
 AdaDelta<DecomposableFunctionType>::AdaDelta(DecomposableFunctionType& function,
-                                           const double stepSize,
-                                           const double rho,
-                                           const double epsilon,
-                                           const size_t maxIterations,
-                                           const double tolerance,
-                                           const bool shuffle) :
+                                             const double stepSize,
+                                             const double rho,
+                                             const double epsilon,
+                                             const size_t maxIterations,
+                                             const double tolerance,
+                                             const bool shuffle) :
     optimizer(function,
               stepSize,
               maxIterations,