diff --git a/lib/asn1/parse.y b/lib/asn1/parse.y
index 103ea5a89..641b07089 100644
--- a/lib/asn1/parse.y
+++ b/lib/asn1/parse.y
@@ -230,7 +230,7 @@ struct string_list {
 
 %%
 
-ModuleDefinition: IDENTIFIER kw_DEFINITIONS TagDefault ExtensionDefault
+ModuleDefinition: IDENTIFIER objid_opt kw_DEFINITIONS TagDefault ExtensionDefault
 			EEQUAL kw_BEGIN ModuleBody kw_END
 		{
 			checkundefined();