diff --git a/dlls/d3dxof/parsing.c b/dlls/d3dxof/parsing.c
index 769e815e751..54566b08e87 100644
--- a/dlls/d3dxof/parsing.c
+++ b/dlls/d3dxof/parsing.c
@@ -1349,7 +1349,8 @@ _exit:
             return FALSE;
         }
 
-        buf->pxo = buf->pxo->children[buf->pxo->nb_children] = &buf->pxo_tab[buf->pxo->root->nb_subobjects++];
+        buf->pxo = buf->pxo->children[buf->pxo->nb_children] = &buf->pxo_tab[buf->pxo->root->nb_subobjects];
+        pxo->root->nb_subobjects++;
 
         TRACE("Enter optional %s\n", (char*)buf->value);
         buf->level++;