diff --git a/src/mlpack/methods/ann/layer/concat.hpp b/src/mlpack/methods/ann/layer/concat.hpp
index 13d29458cb..e693234f3e 100644
--- a/src/mlpack/methods/ann/layer/concat.hpp
+++ b/src/mlpack/methods/ann/layer/concat.hpp
@@ -19,8 +19,6 @@
 #include "../visitor/delta_visitor.hpp"
 #include "../visitor/output_parameter_visitor.hpp"
 
-#include <boost/ptr_container/ptr_vector.hpp>
-
 #include "layer_types.hpp"
 
 namespace mlpack {
diff --git a/src/mlpack/methods/ann/layer/concat_performance.hpp b/src/mlpack/methods/ann/layer/concat_performance.hpp
index b576430479..b7ddbe1625 100644
--- a/src/mlpack/methods/ann/layer/concat_performance.hpp
+++ b/src/mlpack/methods/ann/layer/concat_performance.hpp
@@ -14,8 +14,6 @@
 
 #include <mlpack/prereqs.hpp>
 
-#include <boost/ptr_container/ptr_vector.hpp>
-
 #include "layer_types.hpp"
 
 namespace mlpack {
diff --git a/src/mlpack/methods/ann/layer/highway.hpp b/src/mlpack/methods/ann/layer/highway.hpp
index aa539a4972..526a434d23 100644
--- a/src/mlpack/methods/ann/layer/highway.hpp
+++ b/src/mlpack/methods/ann/layer/highway.hpp
@@ -15,8 +15,6 @@
 
 #include <mlpack/prereqs.hpp>
 
-#include <boost/ptr_container/ptr_vector.hpp>
-
 #include "../visitor/delete_visitor.hpp"
 #include "../visitor/delta_visitor.hpp"
 #include "../visitor/output_height_visitor.hpp"
diff --git a/src/mlpack/methods/ann/layer/recurrent_attention.hpp b/src/mlpack/methods/ann/layer/recurrent_attention.hpp
index b8b4a55a89..63838dc479 100644
--- a/src/mlpack/methods/ann/layer/recurrent_attention.hpp
+++ b/src/mlpack/methods/ann/layer/recurrent_attention.hpp
@@ -13,7 +13,6 @@
 #define MLPACK_METHODS_ANN_LAYER_RECURRENT_ATTENTION_HPP
 
 #include <mlpack/prereqs.hpp>
-#include <boost/ptr_container/ptr_vector.hpp>
 
 #include "../visitor/delta_visitor.hpp"
 #include "../visitor/output_parameter_visitor.hpp"
diff --git a/src/mlpack/methods/ann/layer/sequential.hpp b/src/mlpack/methods/ann/layer/sequential.hpp
index ebf3c6fd6a..bd1857b1ba 100644
--- a/src/mlpack/methods/ann/layer/sequential.hpp
+++ b/src/mlpack/methods/ann/layer/sequential.hpp
@@ -15,8 +15,6 @@
 
 #include <mlpack/prereqs.hpp>
 
-#include <boost/ptr_container/ptr_vector.hpp>
-
 #include "../visitor/delete_visitor.hpp"
 #include "../visitor/copy_visitor.hpp"
 #include "../visitor/delta_visitor.hpp"