diff --git a/include/osgVolume/MultipassTechnique b/include/osgVolume/MultipassTechnique
index 5fa14441b..4d9e9a511 100644
--- a/include/osgVolume/MultipassTechnique
+++ b/include/osgVolume/MultipassTechnique
@@ -16,6 +16,7 @@
 
 #include <osgVolume/VolumeTechnique>
 #include <osg/MatrixTransform>
+#include <osg/Texture2D>
 
 namespace osgVolume {