diff --git a/core/contracts/OffchainExchange.sol b/core/contracts/OffchainExchange.sol
index 9fc8061..ebeeaa0 100644
--- a/core/contracts/OffchainExchange.sol
+++ b/core/contracts/OffchainExchange.sol
@@ -946,6 +946,9 @@ contract OffchainExchange is
         view
         returns (FeeRates memory)
     {
+        if (RiskHelper.isIsolatedSubaccount(subaccount)) {
+            subaccount = parentSubaccounts[subaccount];
+        }
         FeeRates memory userFeeRates = feeRates[
             address(uint160(bytes20(subaccount)))
         ][productId];
diff --git a/core/package.json b/core/package.json
index feeff6e..719aa93 100644
--- a/core/package.json
+++ b/core/package.json
@@ -1,6 +1,6 @@
 {
   "name": "vertex-core",
-  "version": "3.3.0",
+  "version": "3.4.0",
   "license": "UNLICENSED",
   "description": "EVM implementation of Vertex",
   "scripts": {
diff --git a/lba/package.json b/lba/package.json
index 40745ec..f89067a 100644
--- a/lba/package.json
+++ b/lba/package.json
@@ -1,6 +1,6 @@
 {
   "name": "vertex-lba",
-  "version": "3.3.0",
+  "version": "3.4.0",
   "license": "UNLICENSED",
   "description": "Vertex LBA contracts",
   "scripts": {