diff --git a/libraries/libmdb/mdb.c b/libraries/libmdb/mdb.c
index f7559b0..b11edb9 100644
--- a/libraries/libmdb/mdb.c
+++ b/libraries/libmdb/mdb.c
@@ -5586,7 +5586,7 @@ mdb_cursor_txn(MDB_cursor *mc)
 MDB_dbi
 mdb_cursor_dbi(MDB_cursor *mc)
 {
-	if (!mc) return 0;
+	assert(mc != NULL);
 	return mc->mc_dbi;
 }