diff --git a/src/osgParticle/ParticleSystem.cpp b/src/osgParticle/ParticleSystem.cpp
index 42cf4f053..175a60e18 100644
--- a/src/osgParticle/ParticleSystem.cpp
+++ b/src/osgParticle/ParticleSystem.cpp
@@ -394,29 +394,41 @@ void osgParticle::ParticleSystem::drawImplementation(osg::RenderInfo& renderInfo
                     case osgParticle::Particle::HEXAGON:
                     case osgParticle::Particle::QUAD:
                     {
-                        vertices.push_back(xpos-p1-p2);
-                        colors.push_back(color);
-                        texcoords.push_back(osg::Vec2(s_coord, t_coord));
+                        osg::Vec3 c0(xpos-p1-p2);
+                        osg::Vec2 t0(s_coord, t_coord);
+                        osg::Vec3 c1(xpos+p1-p2);
+                        osg::Vec2 t1(s_coord+s_tile, t_coord);
+                        osg::Vec3 c2(xpos+p1+p2);
+                        osg::Vec2 t2(s_coord+s_tile, t_coord+t_tile);
+                        osg::Vec3 c3(xpos-p1+p2);
+                        osg::Vec2 t3(s_coord, t_coord+t_tile);
 
-                        vertices.push_back(xpos+p1-p2);
-                        colors.push_back(color);
-                        texcoords.push_back(osg::Vec2(s_coord+s_tile, t_coord));
+                        // first triangle
+                        vertices.push_back(c0);
+                        vertices.push_back(c1);
+                        vertices.push_back(c2);
+                        texcoords.push_back(t0);
+                        texcoords.push_back(t1);
+                        texcoords.push_back(t2);
 
-                        vertices.push_back(xpos+p1+p2);
-                        colors.push_back(color);
-                        texcoords.push_back(osg::Vec2(s_coord+s_tile, t_coord+t_tile));
+                        // second triangle
+                        vertices.push_back(c2);
+                        vertices.push_back(c3);
+                        vertices.push_back(c0);
+                        texcoords.push_back(t2);
+                        texcoords.push_back(t3);
+                        texcoords.push_back(t0);
 
-                        vertices.push_back(xpos-p1+p2);
-                        colors.push_back(color);
-                        texcoords.push_back(osg::Vec2(s_coord, t_coord+t_tile));
+                        for (int j = 0; j < 6; ++j)
+                            colors.push_back(color);
 
-                        if (!primitives.empty() && primitives.back().first==GL_QUADS)
+                        if (!primitives.empty() && primitives.back().first==GL_TRIANGLES)
                         {
-                            primitives.back().second+=4;
+                            primitives.back().second+=6;
                         }
                         else
                         {
-                            primitives.push_back(ArrayData::ModeCount(GL_QUADS,4));
+                            primitives.push_back(ArrayData::ModeCount(GL_TRIANGLES,6));
                         }
 
                         break;