diff --git a/tests/extmod/btree1.py b/tests/extmod/btree1.py
index 715f628246..2127554db4 100644
--- a/tests/extmod/btree1.py
+++ b/tests/extmod/btree1.py
@@ -85,5 +85,6 @@ try:
 except TypeError:
     print("TypeError")
 
+db.flush()
 db.close()
 f.close()