diff --git a/lib/asn1/lex.l b/lib/asn1/lex.l
index 435c25011..195e6a813 100644
--- a/lib/asn1/lex.l
+++ b/lib/asn1/lex.l
@@ -62,6 +62,7 @@ static void unterminated(const char *, unsigned);
 %p 5000
 %a 5000
 %n 1000
+%o 10000
 
 %%
 ABSENT			{ return kw_ABSENT; }