diff --git a/components/terrain/chunkmanager.hpp b/components/terrain/chunkmanager.hpp
index 58db98dc9..553e06d97 100644
--- a/components/terrain/chunkmanager.hpp
+++ b/components/terrain/chunkmanager.hpp
@@ -11,11 +11,6 @@ namespace osg
     class Texture2D;
 }
 
-namespace SceneUtil
-{
-    class PositionAttitudeTransform;
-}
-
 namespace Resource
 {
     class SceneManager;
diff --git a/components/terrain/compositemaprenderer.hpp b/components/terrain/compositemaprenderer.hpp
index 8e53cbdaa..15e939389 100644
--- a/components/terrain/compositemaprenderer.hpp
+++ b/components/terrain/compositemaprenderer.hpp
@@ -5,7 +5,7 @@
 
 #include <OpenThreads/Mutex>
 
-#include <deque>
+#include <set>
 
 namespace osg
 {
diff --git a/components/terrain/material.cpp b/components/terrain/material.cpp
index d35fd39ac..e3e6f6de3 100644
--- a/components/terrain/material.cpp
+++ b/components/terrain/material.cpp
@@ -1,6 +1,5 @@
 #include "material.hpp"
 
-#include <iostream>
 #include <stdexcept>
 
 #include <osg/Depth>
diff --git a/components/terrain/quadtreeworld.hpp b/components/terrain/quadtreeworld.hpp
index 6176d768f..8ec75917b 100644
--- a/components/terrain/quadtreeworld.hpp
+++ b/components/terrain/quadtreeworld.hpp
@@ -1,8 +1,6 @@
 #ifndef COMPONENTS_TERRAIN_QUADTREEWORLD_H
 #define COMPONENTS_TERRAIN_QUADTREEWORLD_H
 
-#include <map>
-
 #include "world.hpp"
 
 #include <OpenThreads/Mutex>