diff --git a/contracts/vault/VaultBase.sol b/contracts/vault/VaultBase.sol
index be21481..f22b4ed 100644
--- a/contracts/vault/VaultBase.sol
+++ b/contracts/vault/VaultBase.sol
@@ -227,7 +227,7 @@ abstract contract VaultBase {
     require(fund.status() == FundStatus.Locked, VaultFundNotLocked());
 
     Account memory account = _accounts[controller][fundId][accountId];
-    require(account.flow.incoming == account.flow.outgoing, VaultFlowNotZero());
+    require(!(account.flow.incoming == account.flow.outgoing), VaultFlowNotZero());
     uint128 amount = account.balance.available + account.balance.designated;
 
     delete _accounts[controller][fundId][accountId];