diff --git a/src/osgPlugins/OpenFlight/Vertex.cpp b/src/osgPlugins/OpenFlight/Vertex.cpp
index 9f3f8fa6d..cb287676e 100644
--- a/src/osgPlugins/OpenFlight/Vertex.cpp
+++ b/src/osgPlugins/OpenFlight/Vertex.cpp
@@ -33,24 +33,24 @@ Vertex::Vertex(const Vertex& vertex):
     }
 }
 
-void Vertex::setCoord(const osg::Vec3 coord)
+void Vertex::setCoord(const osg::Vec3& coord)
 {
     _coord = coord;
 }
 
-void Vertex::setColor(const osg::Vec4 color)
+void Vertex::setColor(const osg::Vec4& color)
 {
     _color = color;
     _validColor = true;
 }
 
-void Vertex::setNormal(const osg::Vec3 normal)
+void Vertex::setNormal(const osg::Vec3& normal)
 {
     _normal = normal;
     _validNormal = true;
 }
 
-void Vertex::setUV(int layer, const osg::Vec2 uv)
+void Vertex::setUV(int layer, const osg::Vec2& uv)
 {
     if (layer>=0 && layer<MAX_LAYERS)
     {
diff --git a/src/osgPlugins/OpenFlight/Vertex.h b/src/osgPlugins/OpenFlight/Vertex.h
index fb1ce8af6..37268a488 100644
--- a/src/osgPlugins/OpenFlight/Vertex.h
+++ b/src/osgPlugins/OpenFlight/Vertex.h
@@ -22,10 +22,10 @@ public:
     Vertex();
     Vertex(const Vertex& vertex);
 
-    void setCoord(const osg::Vec3 coord);
-    void setColor(const osg::Vec4 color);
-    void setNormal(const osg::Vec3 normal);
-    void setUV(int layer, const osg::Vec2 uv);
+    void setCoord(const osg::Vec3& coord);
+    void setColor(const osg::Vec4& color);
+    void setNormal(const osg::Vec3& normal);
+    void setUV(int layer, const osg::Vec2& uv);
 
     bool validColor() const { return _validColor; }
     bool validNormal() const { return _validNormal; }