diff --git a/lib/hdb/Makefile.am b/lib/hdb/Makefile.am
index 3c79219fd..90c692f4c 100644
--- a/lib/hdb/Makefile.am
+++ b/lib/hdb/Makefile.am
@@ -120,7 +120,7 @@ $(srcdir)/hdb-private.h:
 $(gen_files_hdb) hdb_asn1.hx hdb_asn1-priv.hx: hdb_asn1_files
 
 hdb_asn1_files: $(ASN1_COMPILE_DEP) $(srcdir)/hdb.asn1
-	$(ASN1_COMPILE) $(srcdir)/hdb.asn1 hdb_asn1
+	$(ASN1_COMPILE) --sequence=HDB-Ext-KeySet $(srcdir)/hdb.asn1 hdb_asn1
 
 test_dbinfo_LIBS = libhdb.la