diff --git a/panda/src/particlesystem/lineParticleRenderer.cxx b/panda/src/particlesystem/lineParticleRenderer.cxx
index cae310b56e..4acb957f77 100644
--- a/panda/src/particlesystem/lineParticleRenderer.cxx
+++ b/panda/src/particlesystem/lineParticleRenderer.cxx
@@ -138,10 +138,10 @@ void LineParticleRenderer::
 init_geoms() {
   _vdata = new GeomVertexData
     ("particles", GeomVertexFormat::get_v3cp(),
-     Geom::UH_dynamic);
+     Geom::UH_stream);
   PT(Geom) geom = new Geom(_vdata);
   _line_primitive = geom;
-  _lines = new GeomLines(Geom::UH_dynamic);
+  _lines = new GeomLines(Geom::UH_stream);
   geom->add_primitive(_lines);
 
   GeomNode *render_node = get_render_node();
diff --git a/panda/src/particlesystem/pointParticleRenderer.cxx b/panda/src/particlesystem/pointParticleRenderer.cxx
index 6eac499cb2..b763393269 100644
--- a/panda/src/particlesystem/pointParticleRenderer.cxx
+++ b/panda/src/particlesystem/pointParticleRenderer.cxx
@@ -113,10 +113,10 @@ void PointParticleRenderer::
 init_geoms() {
   _vdata = new GeomVertexData
     ("particles", GeomVertexFormat::get_v3cp(),
-     Geom::UH_dynamic);
+     Geom::UH_stream);
   PT(Geom) geom = new Geom(_vdata);
   _point_primitive = geom;
-  _points = new GeomPoints(Geom::UH_dynamic);
+  _points = new GeomPoints(Geom::UH_stream);
   geom->add_primitive(_points);
   
   GeomNode *render_node = get_render_node();
diff --git a/panda/src/particlesystem/sparkleParticleRenderer.cxx b/panda/src/particlesystem/sparkleParticleRenderer.cxx
index a68b77feb6..789883e083 100644
--- a/panda/src/particlesystem/sparkleParticleRenderer.cxx
+++ b/panda/src/particlesystem/sparkleParticleRenderer.cxx
@@ -134,10 +134,10 @@ void SparkleParticleRenderer::
 init_geoms() {
   _vdata = new GeomVertexData
     ("particles", GeomVertexFormat::get_v3cp(),
-     Geom::UH_dynamic);
+     Geom::UH_stream);
   PT(Geom) geom = new Geom(_vdata);
   _line_primitive = geom;
-  _lines = new GeomLines(Geom::UH_dynamic);
+  _lines = new GeomLines(Geom::UH_stream);
   geom->add_primitive(_lines);
 
   GeomNode *render_node = get_render_node();
diff --git a/panda/src/particlesystem/spriteParticleRenderer.cxx b/panda/src/particlesystem/spriteParticleRenderer.cxx
index a8355c4f8c..580e00b90a 100644
--- a/panda/src/particlesystem/spriteParticleRenderer.cxx
+++ b/panda/src/particlesystem/spriteParticleRenderer.cxx
@@ -503,10 +503,10 @@ init_geoms() {
     // For each frame of the animation...
     for (j = 0; j < _anim_size[i]; ++j) {
       _ttl_count[i] = (int *)PANDA_MALLOC_ARRAY(_anim_size[i] * sizeof(int));
-      _vdata[i].push_back(new GeomVertexData("particles", format, Geom::UH_dynamic));
+      _vdata[i].push_back(new GeomVertexData("particles", format, Geom::UH_stream));
       PT(Geom) geom = new Geom(_vdata[i][j]);
       _sprite_primitive[i].push_back((Geom*)geom);
-      _sprites[i].push_back(new GeomPoints(Geom::UH_dynamic));
+      _sprites[i].push_back(new GeomPoints(Geom::UH_stream));
       geom->add_primitive(_sprites[i][j]);
       
       // This will be overwritten in render(), but we had to have some initial value