diff --git a/src/osgUtil/SceneGraphBuilder.cpp b/src/osgUtil/SceneGraphBuilder.cpp
index 7c90c6f67..ec468fa24 100644
--- a/src/osgUtil/SceneGraphBuilder.cpp
+++ b/src/osgUtil/SceneGraphBuilder.cpp
@@ -40,7 +40,8 @@ SceneGraphBuilder::SceneGraphBuilder():
     _colorSet(false),
     _color(1.0f,1.0f,1.0f,1.0f),
     _maxNumTexCoordComponents(0),
-    _texCoord(0.f,0.0f,0.0f,1.0f)
+    _texCoord(0.f,0.0f,0.0f,1.0f),
+    _primitiveMode(0)
 {
 }