diff --git a/tests/extmod/btree_gc.py b/tests/extmod/btree_gc.py
index 153f4e7d78..1845aa0640 100644
--- a/tests/extmod/btree_gc.py
+++ b/tests/extmod/btree_gc.py
@@ -21,3 +21,6 @@ for i in range(N):
     db[b"thekey" + str(i)] = b"thelongvalue" + str(i)
     print(db[b"thekey" + str(i)])
     gc.collect()
+
+# Reclaim memory allocated by the db object.
+db.close()