diff --git a/spec/withdraw.bear.yaml b/spec/withdraw.bear.yaml
index 7efc595..314507b 100644
--- a/spec/withdraw.bear.yaml
+++ b/spec/withdraw.bear.yaml
@@ -31,6 +31,3 @@ block:
       port: idempotency
       getOp: get
       putOp: put
-  invariants:
-    - kind: non_negative
-      field: balance
\ No newline at end of file