diff --git a/src/osgPlugins/stl/ReaderWriterSTL.cpp b/src/osgPlugins/stl/ReaderWriterSTL.cpp
index 729d8ef00..11d5a48f8 100644
--- a/src/osgPlugins/stl/ReaderWriterSTL.cpp
+++ b/src/osgPlugins/stl/ReaderWriterSTL.cpp
@@ -108,6 +108,8 @@ private:
                     ++itr)
                 {
                     perVertexNormals->push_back(*itr);
+                    perVertexNormals->push_back(*itr);
+                    perVertexNormals->push_back(*itr);
                 }
 
                 geom->setNormalArray(perVertexNormals.get(), osg::Array::BIND_PER_VERTEX);