diff --git a/src/osgParticle/ParticleProcessor.cpp b/src/osgParticle/ParticleProcessor.cpp
index c8ba61b9a..d0e7e538a 100644
--- a/src/osgParticle/ParticleProcessor.cpp
+++ b/src/osgParticle/ParticleProcessor.cpp
@@ -99,10 +99,12 @@ void osgParticle::ParticleProcessor::traverse(osg::NodeVisitor& nv)
                         _currentTime += t - _t0;
 
                         // process only if the particle system is not frozen/culled
+                        // We need to allow at least 2 frames difference, because the particle system's lastFrameNumber
+                        // is updated in the draw thread which may not have completed yet.
                         if (alive &&
                             _enabled &&
                             !_ps->isFrozen() &&
-                            ((_ps->getLastFrameNumber()+1) >= (nv.getFrameStamp()->getFrameNumber()) || !_ps->getFreezeOnCull()))
+                            (!_ps->getFreezeOnCull() || ((nv.getFrameStamp()->getFrameNumber()-_ps->getLastFrameNumber()) <= 2)) )
                         {
                             // initialize matrix flags
                             _need_ltw_matrix = true;
diff --git a/src/osgParticle/ParticleSystemUpdater.cpp b/src/osgParticle/ParticleSystemUpdater.cpp
index e2aeef75b..5aa481be5 100644
--- a/src/osgParticle/ParticleSystemUpdater.cpp
+++ b/src/osgParticle/ParticleSystemUpdater.cpp
@@ -41,7 +41,10 @@ void osgParticle::ParticleSystemUpdater::traverse(osg::NodeVisitor& nv)
 
                         ParticleSystem::ScopedWriteLock lock(*(ps->getReadWriteMutex()));
 
-                        if (!ps->isFrozen() && (ps->getLastFrameNumber() >= (nv.getFrameStamp()->getFrameNumber() - 1) || !ps->getFreezeOnCull()))
+                        // We need to allow at least 2 frames difference, because the particle system's lastFrameNumber
+                        // is updated in the draw thread which may not have completed yet.
+                        if (!ps->isFrozen() &&
+                            (!ps->getFreezeOnCull() || ((nv.getFrameStamp()->getFrameNumber()-ps->getLastFrameNumber()) <= 2)) )
                         {
                             ps->update(t - _t0, nv);
                         }