diff --git a/Parser/Python.asdl b/Parser/Python.asdl
index a4394c9..f791709 100644
--- a/Parser/Python.asdl
+++ b/Parser/Python.asdl
@@ -34,7 +34,7 @@
 	      | Assert(expr test, expr? msg)
 
 	      | Import(alias* names)
-	      | ImportFrom(identifier module, alias* names, int? level)
+	      | ImportFrom(identifier? module, alias* names, int? level)
 
 	      -- Doesn't capture requirement that locals must be
 	      -- defined if globals is