diff --git a/panda/src/gobj/geom.cxx b/panda/src/gobj/geom.cxx
index 4fc2b8ceb2..820c67875e 100644
--- a/panda/src/gobj/geom.cxx
+++ b/panda/src/gobj/geom.cxx
@@ -805,6 +805,11 @@ make_lines_in_place() {
 #endif
   }
 
+  if (cdata->_primitive_type == PT_polygons ||
+      cdata->_primitive_type == PT_patches) {
+    cdata->_primitive_type = PT_lines;
+  }
+
   cdata->_modified = Geom::get_next_modified();
   reset_geom_rendering(cdata);
   clear_cache_stage(current_thread);
@@ -842,6 +847,10 @@ make_points_in_place() {
 #endif
   }
 
+  if (cdata->_primitive_type != PT_none) {
+    cdata->_primitive_type = PT_points;
+  }
+
   cdata->_modified = Geom::get_next_modified();
   reset_geom_rendering(cdata);
   clear_cache_stage(current_thread);
@@ -879,6 +888,10 @@ make_patches_in_place() {
 #endif
   }
 
+  if (cdata->_primitive_type != PT_none) {
+    cdata->_primitive_type = PT_patches;
+  }
+
   cdata->_modified = Geom::get_next_modified();
   reset_geom_rendering(cdata);
   clear_cache_stage(current_thread);