diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7be7bcede..f6bd3ca12 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,12 @@
 # Changelog
 
 ## vNEXT
+
+### Updated contracts
+- [x] `IexecPoco2Delegate.sol`
+
+### Features
+- Remove unnecessary back and forth transfers in `IexecPoco2Delegate` happening during `claim(..)`. (#167)
 - Remove references to blockscout v5. (#161)
 - Migrate integration test files to Typescript & Hardhat:
     - 000_fullchain.js (#156, #157)
diff --git a/contracts/modules/delegates/IexecPoco2Delegate.sol b/contracts/modules/delegates/IexecPoco2Delegate.sol
index 33aeecec4..893efcc1d 100644
--- a/contracts/modules/delegates/IexecPoco2Delegate.sol
+++ b/contracts/modules/delegates/IexecPoco2Delegate.sol
@@ -61,8 +61,15 @@ contract IexecPoco2Delegate is IexecPoco2, DelegateBase, IexecEscrow, SignatureV
 
         unlock(deal.sponsor, taskPrice); // Refund the payer of the task
         seize(deal.workerpool.owner, poolstake, _taskid);
-        reward(KITTY_ADDRESS, poolstake, _taskid); // → Kitty / Burn
-        lock(KITTY_ADDRESS, poolstake); // → Kitty / Burn
+        /**
+         * Reward kitty and lock value on it.
+         * Next lines optimize simple `reward(kitty, ..)` and `lock(kitty, ..)` calls
+         * where functions would together uselessly transfer value from main PoCo
+         * proxy to kitty, then would transfer value back from kitty to main PoCo proxy.
+         */
+        m_frozens[KITTY_ADDRESS] += poolstake; // → Kitty / Burn
+        emit Reward(KITTY_ADDRESS, poolstake, _taskid);
+        emit Lock(KITTY_ADDRESS, poolstake);
     }
 
     /***************************************************************************
diff --git a/test/byContract/IexecPoco/04_finalize.test.ts b/test/byContract/IexecPoco/04_finalize.test.ts
index dcc9fc708..e4fcded5b 100644
--- a/test/byContract/IexecPoco/04_finalize.test.ts
+++ b/test/byContract/IexecPoco/04_finalize.test.ts
@@ -338,7 +338,6 @@ describe('IexecPoco2#finalize', async () => {
         const sponsorFrozenBefore = await iexecPoco.frozenOf(sponsor.address);
 
         await expect(iexecPocoAsScheduler.finalize(taskId, results, '0x'))
-            .to.emit(iexecPoco, 'TaskFinalize')
             .to.changeTokenBalances(
                 iexecPoco,
                 [requester, sponsor, appProvider, datasetProvider],
@@ -348,7 +347,8 @@ describe('IexecPoco2#finalize', async () => {
                     appPrice, // app provider is rewarded
                     0, // but dataset provider is not rewarded
                 ],
-            );
+            )
+            .to.emit(iexecPoco, 'TaskFinalize');
         expect(await iexecPoco.frozenOf(requester.address)).to.be.equal(
             requesterFrozenBefore - taskPrice,
         );
@@ -517,14 +517,6 @@ describe('IexecPoco2#finalize', async () => {
                     (await iexecPoco.viewTask(kittyFillingDeal.taskId)).finalDeadline,
                 );
                 await expect(iexecPoco.claim(kittyFillingDeal.taskId))
-                    .to.emit(iexecPoco, 'Transfer')
-                    .withArgs(iexecPoco.address, kittyAddress, kittyFillingSchedulerTaskStake)
-                    .to.emit(iexecPoco, 'Reward')
-                    .withArgs(kittyAddress, kittyFillingSchedulerTaskStake, kittyFillingDeal.taskId)
-                    .to.emit(iexecPoco, 'Transfer')
-                    .withArgs(kittyAddress, iexecPoco.address, kittyFillingSchedulerTaskStake)
-                    .to.emit(iexecPoco, 'Lock')
-                    .withArgs(kittyAddress, kittyFillingSchedulerTaskStake)
                     .to.changeTokenBalances(
                         iexecPoco,
                         [iexecPoco, kittyAddress],
@@ -532,7 +524,11 @@ describe('IexecPoco2#finalize', async () => {
                             -workerpoolPriceToFillKitty, // deal payer is refunded
                             0,
                         ],
-                    );
+                    )
+                    .to.emit(iexecPoco, 'Reward')
+                    .withArgs(kittyAddress, kittyFillingSchedulerTaskStake, kittyFillingDeal.taskId)
+                    .to.emit(iexecPoco, 'Lock')
+                    .withArgs(kittyAddress, kittyFillingSchedulerTaskStake);
                 const kittyFrozenAfterClaim = (await iexecPoco.frozenOf(kittyAddress)).toNumber();
                 expect(kittyFrozenAfterClaim).to.equal(
                     kittyFrozenBeforeClaim + kittyFillingSchedulerTaskStake,
@@ -579,6 +575,11 @@ describe('IexecPoco2#finalize', async () => {
                     .reveal(taskId, resultDigest)
                     .then((tx) => tx.wait());
                 await expect(iexecPocoAsScheduler.finalize(taskId, results, '0x'))
+                    .to.changeTokenBalances(
+                        iexecPoco,
+                        [iexecPoco, scheduler, kittyAddress],
+                        [-expectedSchedulerKittyPartReward, expectedSchedulerKittyPartReward, 0],
+                    )
                     .to.emit(iexecPoco, 'TaskFinalize')
                     .to.emit(iexecPoco, 'Seize')
                     .withArgs(kittyAddress, expectedSchedulerKittyPartReward, taskId)
@@ -589,12 +590,7 @@ describe('IexecPoco2#finalize', async () => {
                         expectedSchedulerKittyPartReward,
                     )
                     .to.emit(iexecPoco, 'Reward')
-                    .withArgs(scheduler.address, expectedSchedulerKittyPartReward, taskId)
-                    .to.changeTokenBalances(
-                        iexecPoco,
-                        [iexecPoco, scheduler, kittyAddress],
-                        [-expectedSchedulerKittyPartReward, expectedSchedulerKittyPartReward, 0],
-                    );
+                    .withArgs(scheduler.address, expectedSchedulerKittyPartReward, taskId);
                 expect(await iexecPoco.frozenOf(kittyAddress)).to.equal(
                     kittyFrozenAfterClaim - expectedSchedulerKittyPartReward,
                 );
diff --git a/test/byContract/IexecPoco/06_claim.test.ts b/test/byContract/IexecPoco/06_claim.test.ts
index 707dcb7fe..e93a166d8 100644
--- a/test/byContract/IexecPoco/06_claim.test.ts
+++ b/test/byContract/IexecPoco/06_claim.test.ts
@@ -144,12 +144,8 @@ describe('IexecPoco2#claim', async () => {
             .withArgs(sponsor.address, taskPrice)
             .to.emit(iexecPoco, 'Seize')
             .withArgs(scheduler.address, schedulerTaskStake, taskId)
-            .to.emit(iexecPoco, 'Transfer')
-            .withArgs(iexecPoco.address, kittyAddress, schedulerTaskStake)
             .to.emit(iexecPoco, 'Reward')
             .withArgs(kittyAddress, schedulerTaskStake, taskId)
-            .to.emit(iexecPoco, 'Transfer')
-            .withArgs(kittyAddress, iexecPoco.address, schedulerTaskStake)
             .to.emit(iexecPoco, 'Lock')
             .withArgs(kittyAddress, schedulerTaskStake);
         for (const worker of workers) {