diff --git a/src/osgTerrain/DataSet.cpp b/src/osgTerrain/DataSet.cpp
index 0b7733f6d..aae5ed845 100644
--- a/src/osgTerrain/DataSet.cpp
+++ b/src/osgTerrain/DataSet.cpp
@@ -20,6 +20,7 @@
 #include <osg/MatrixTransform>
 #include <osg/ClusterCullingCallback>
 #include <osg/Notify>
+#include <osg/io_utils>
 
 #include <osg/GLU>