diff --git a/src/p_spec.c b/src/p_spec.c
index a20a339ed..65f7fcd67 100644
--- a/src/p_spec.c
+++ b/src/p_spec.c
@@ -1218,7 +1218,7 @@ static void PolyVisible(line_t *line)
 		po->flags |= POF_SOLID;
 
 	po->flags &= ~POF_NOSPECIALS;
-	po->flags |= POF_RENDERALL;
+	po->flags |= (po->spawnflags & POF_RENDERALL);
 }
 
 //