diff --git a/src/osgParticle/ParticleSystem.cpp b/src/osgParticle/ParticleSystem.cpp
index 6266376dd..d768e0471 100644
--- a/src/osgParticle/ParticleSystem.cpp
+++ b/src/osgParticle/ParticleSystem.cpp
@@ -207,7 +207,7 @@ void osgParticle::ParticleSystem::single_pass_render(osg::State&  /*state*/, con
         }
         
         scaled_aligned_xAxis *= xScale;
-        scaled_aligned_xAxis *= yScale;
+        scaled_aligned_yAxis *= yScale;
         
         xAxis *= xScale;
         yAxis *= yScale;