diff --git a/lib/hdb/hdb.c b/lib/hdb/hdb.c
index adfb76c2a..959c23d05 100644
--- a/lib/hdb/hdb.c
+++ b/lib/hdb/hdb.c
@@ -62,7 +62,7 @@ static struct hdb_method methods[] = {
 
 krb5_error_code
 hdb_next_enctype2key(krb5_context context,
-		     hdb_entry *e,
+		     const hdb_entry *e,
 		     krb5_enctype enctype,
 		     Key **key)
 {