diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c
index 388ec72..49645181 100644
--- a/Python/bltinmodule.c
+++ b/Python/bltinmodule.c
@@ -443,7 +443,7 @@
 	}
 
 	if (supplied_flags &
-	    ~(PyCF_MASK | PyCF_MASK_OBSOLETE | PyCF_DONT_IMPLY_DEDENT))
+	    ~(PyCF_MASK | PyCF_MASK_OBSOLETE | PyCF_DONT_IMPLY_DEDENT | PyCF_ONLY_AST))
 	{
 		PyErr_SetString(PyExc_ValueError,
 				"compile(): unrecognised flags");