diff --git a/contracts/smart-account/modules/SessionValidationModules/ERC20SessionValidationModule.sol b/contracts/smart-account/modules/SessionValidationModules/ERC20SessionValidationModule.sol
index 647c4a57..e6b5c777 100644
--- a/contracts/smart-account/modules/SessionValidationModules/ERC20SessionValidationModule.sol
+++ b/contracts/smart-account/modules/SessionValidationModules/ERC20SessionValidationModule.sol
@@ -22,7 +22,7 @@ contract ERC20SessionValidationModule is ISessionValidationModule {
      * @param callValue value to be sent with the call
      * @param _funcCallData the data for the call. is parsed inside the SVM
      * @param _sessionKeyData SessionKey data, that describes sessionKey permissions
-     * @param _callSpecificData additional data. expected to store userOp.sender address in this case
+     * param _callSpecificData additional data.
      * for example to store a list of allowed tokens or receivers
      */
     function validateSessionParams(
@@ -30,15 +30,14 @@ contract ERC20SessionValidationModule is ISessionValidationModule {
         uint256 callValue,
         bytes calldata _funcCallData,
         bytes calldata _sessionKeyData,
-        bytes calldata _callSpecificData
+        bytes calldata /*_callSpecificData */
     ) external virtual override returns (address) {
         return
             _validateSessionParams(
                 destinationContract,
                 callValue,
                 _funcCallData,
-                _sessionKeyData,
-                address(bytes20(_callSpecificData[0:20]))
+                _sessionKeyData
             );
     }
 
@@ -84,8 +83,7 @@ contract ERC20SessionValidationModule is ISessionValidationModule {
                 tokenAddr,
                 callValue,
                 data,
-                _sessionKeyData,
-                _op.sender
+                _sessionKeyData
             ) ==
             ECDSA.recover(
                 ECDSA.toEthSignedMessageHash(_userOpHash),
@@ -106,15 +104,13 @@ contract ERC20SessionValidationModule is ISessionValidationModule {
      * @param callValue value to be sent with the call
      * @param _funcCallData the data for the call. is parsed inside the SVM
      * @param _sessionKeyData SessionKey data, that describes sessionKey permissions
-     * @param userOpSender address of the userOp sender
      * @return sessionKey address of the sessionKey
      */
     function _validateSessionParams(
         address destinationContract,
         uint256 callValue,
         bytes calldata _funcCallData,
-        bytes calldata _sessionKeyData,
-        address userOpSender
+        bytes calldata _sessionKeyData
     ) internal returns (address) {
         (
             address sessionKey,
@@ -127,6 +123,8 @@ contract ERC20SessionValidationModule is ISessionValidationModule {
                 (address, address, address, uint256, uint256)
             );
 
+        address userOpSender = address(uint160(maxUsage >> 64));
+        maxUsage = uint64(maxUsage);
         require(destinationContract == token, "ERC20SV Wrong Token");
         require(callValue == 0, "ERC20SV Non Zero Value");
 
diff --git a/test/bundler-integration/module/BatchedSessionRouter.Module.specs.ts b/test/bundler-integration/module/BatchedSessionRouter.Module.specs.ts
index 4b477334..16fa0ded 100644
--- a/test/bundler-integration/module/BatchedSessionRouter.Module.specs.ts
+++ b/test/bundler-integration/module/BatchedSessionRouter.Module.specs.ts
@@ -121,6 +121,10 @@ describe("SessionKey: Batched Session Router (via Bundler)", async () => {
       ).deploy();
 
       const maxUsage = 10;
+      const maxUsageAndSAAddress = ethers.utils.hexConcat([
+        userSA.address,
+        ethers.utils.hexZeroPad(ethers.utils.hexlify(maxUsage), 8),
+      ]);
 
       // create leaf for the erc20 session validation module
       const { sessionKeyData, leafData } = await getERC20SessionKeyParams(
@@ -128,7 +132,7 @@ describe("SessionKey: Batched Session Router (via Bundler)", async () => {
         mockToken.address,
         mockProtocol.address,
         maxAmount,
-        maxUsage,
+        maxUsageAndSAAddress,
         0,
         0,
         erc20SessionModule.address
@@ -141,7 +145,7 @@ describe("SessionKey: Batched Session Router (via Bundler)", async () => {
           mockProtocol.address, // contract to interact with
           mockToken.address, // token to transfer to protocol
           maxAmount,
-          maxUsage,
+          maxUsageAndSAAddress,
           0,
           0,
           mockProtocolSVModule.address
@@ -257,7 +261,7 @@ describe("SessionKey: Batched Session Router (via Bundler)", async () => {
             erc20SessionModule.address,
             sessionKeyData,
             merkleTree.getHexProof(ethers.utils.keccak256(leafData)),
-            userSA.address,
+            "0x",
           ],
           [
             0,
@@ -265,7 +269,7 @@ describe("SessionKey: Batched Session Router (via Bundler)", async () => {
             mockProtocolSVM.address,
             sessionKeyData2,
             merkleTree.getHexProof(ethers.utils.keccak256(leafData2)),
-            userSA.address,
+            "0x",
           ],
         ],
         signatureOverUserOpHash,
diff --git a/test/bundler-integration/module/MultichainValidator.Module.specs.ts b/test/bundler-integration/module/MultichainValidator.Module.specs.ts
index 148cc3bf..eaf2861f 100644
--- a/test/bundler-integration/module/MultichainValidator.Module.specs.ts
+++ b/test/bundler-integration/module/MultichainValidator.Module.specs.ts
@@ -117,13 +117,17 @@ describe("MultichainValidator Module", async () => {
     // ============== session key setup =============
 
     const maxUsageOfTheSession = 10;
+    const maxUsageAndSAAddress = ethers.utils.hexConcat([
+      expectedSmartAccountAddress,
+      ethers.utils.hexZeroPad(ethers.utils.hexlify(maxUsageOfTheSession), 8),
+    ]);
 
     const { leafData } = await getERC20SessionKeyParams(
       sessionKey.address,
       mockToken.address,
       charlie.address,
       maxAmount,
-      maxUsageOfTheSession,
+      maxUsageAndSAAddress,
       0,
       0,
       erc20SessionModule.address
diff --git a/test/bundler-integration/module/SessionValidationModules/ERC20SessionValidation.Module.specs.ts b/test/bundler-integration/module/SessionValidationModules/ERC20SessionValidation.Module.specs.ts
index bb55bbc5..0f513455 100644
--- a/test/bundler-integration/module/SessionValidationModules/ERC20SessionValidation.Module.specs.ts
+++ b/test/bundler-integration/module/SessionValidationModules/ERC20SessionValidation.Module.specs.ts
@@ -3,7 +3,6 @@ import {
   makeEcdsaSessionKeySignedUserOp,
   enableNewTreeForSmartAccountViaEcdsa,
   getERC20SessionKeyParams,
-  addLeavesForSmartAccountViaEcdsa,
 } from "../../../utils/sessionKey";
 import { ethers, deployments } from "hardhat";
 import { makeEcdsaModuleUserOp, fillAndSign } from "../../../utils/userOp";
@@ -110,13 +109,17 @@ describe("SessionKey: ERC20 Session Validation Module (with Bundler)", async ()
     ).deploy();
 
     const maxUsageOfTheSession = 10;
+    const maxUsageAndSAAddress = ethers.utils.hexConcat([
+      userSA.address,
+      ethers.utils.hexZeroPad(ethers.utils.hexlify(maxUsageOfTheSession), 8),
+    ]);
 
     const { sessionKeyData, leafData } = await getERC20SessionKeyParams(
       sessionKey.address,
       mockToken.address,
       charlie.address,
       maxAmount,
-      maxUsageOfTheSession,
+      maxUsageAndSAAddress,
       0,
       0,
       erc20SessionModule.address
diff --git a/test/module/SessionValidationModules/ERC20SessionValidation.Module.specs.ts b/test/module/SessionValidationModules/ERC20SessionValidation.Module.specs.ts
index 343dc90d..c28ad34e 100644
--- a/test/module/SessionValidationModules/ERC20SessionValidation.Module.specs.ts
+++ b/test/module/SessionValidationModules/ERC20SessionValidation.Module.specs.ts
@@ -78,13 +78,19 @@ describe("SessionKey: ERC20 Session Validation Module", async () => {
     ).deploy();
 
     const maxUsageOfTheSession = 1;
+    const maxUsageAndSAAddress = ethers.utils.hexConcat([
+      userSA.address,
+      ethers.utils.hexZeroPad(ethers.utils.hexlify(maxUsageOfTheSession), 8),
+    ]);
+
+    console.log(maxUsageAndSAAddress);
 
     const { sessionKeyData, leafData } = await getERC20SessionKeyParams(
       sessionKey.address,
       mockToken.address,
       charlie.address,
       maxAmount,
-      maxUsageOfTheSession,
+      maxUsageAndSAAddress,
       0,
       0,
       erc20SessionModule.address
@@ -117,7 +123,7 @@ describe("SessionKey: ERC20 Session Validation Module", async () => {
       merkleTree: merkleTree,
       vulnerableErc20SessionModule: vulnerableErc20SessionModule,
       sessionKey: sessionKey,
-      maxUsageOfTheSession: maxUsageOfTheSession,
+      maxUsageOfTheSession: maxUsageAndSAAddress,
     };
   });
 
diff --git a/test/utils/sessionKey.ts b/test/utils/sessionKey.ts
index 177fac8e..964a24bb 100644
--- a/test/utils/sessionKey.ts
+++ b/test/utils/sessionKey.ts
@@ -204,7 +204,7 @@ export async function getERC20SessionKeyParams(
   erc20TokenAddress: string,
   receiverAddress: string,
   maxAmountToTransfer: BigNumber,
-  maxUsage: number,
+  maxUsage: string,
   validUntil: number,
   validAfter: number,
   sessionValidationModuleAddress: string