diff --git a/src/interface/unstable/IOrderBookV6.sol b/src/interface/unstable/IOrderBookV6.sol
index f8e260c..8970846 100644
--- a/src/interface/unstable/IOrderBookV6.sol
+++ b/src/interface/unstable/IOrderBookV6.sol
@@ -17,10 +17,6 @@ import {
 /// Import unmodified structures from older versions of `IOrderBook`.
 import {
     ClearStateChangeV2,
-    //forge-lint: disable-next-line(unused-import)
-    NoOrders,
-    //forge-lint: disable-next-line(unused-import)
-    ZeroMaximumInput,
     ClearConfigV2,
     TaskV2,
     //forge-lint: disable-next-line(unused-import)
@@ -220,6 +216,12 @@ interface IOrderBookV6 is IERC3156FlashLender, IInterpreterCallerV4 {
     /// MUST be thrown by `addOrder` if the order has no outputs.
     error OrderNoOutputs();
 
+    /// MUST be thrown by `takeOrders` if the maximum input/output is zero.
+    error ZeroMaximumInput();
+
+    /// MUST be thrown when take orders is called with no orders.
+    error NoOrders();
+
     /// Some tokens have been deposited to a vault.
     /// @param sender `msg.sender` depositing tokens. Delegated deposits are NOT
     /// supported.