diff --git a/contracts/schemes/Locking4Reputation.sol b/contracts/schemes/Locking4Reputation.sol
index 1ab1b83d..542de34e 100644
--- a/contracts/schemes/Locking4Reputation.sol
+++ b/contracts/schemes/Locking4Reputation.sol
@@ -117,6 +117,9 @@ contract Locking4Reputation {
         uint256 score = _period.mul(_amount).mul(_numerator).div(_denominator);
         require(score > 0, "score must me > 0");
         scores[_locker] = scores[_locker].add(score);
+        //verify that redeem will not overflow for this locker
+        require((scores[_locker] * reputationReward)/scores[_locker] == reputationReward,
+        "score is too high");
         totalScore = totalScore.add(score);
 
         emit Lock(_locker, lockingId, _amount, _period);
diff --git a/package-lock.json b/package-lock.json
index 75a205f3..e87e0916 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "@daostack/arc",
-  "version": "0.0.1-rc.6",
+  "version": "0.0.1-rc.7",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
diff --git a/package.json b/package.json
index ca33f466..5a4e9376 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@daostack/arc",
-  "version": "0.0.1-rc.6",
+  "version": "0.0.1-rc.7",
   "description": "A platform for building DAOs",
   "files": [
     "contracts/",
@@ -16,7 +16,7 @@
   },
   "scripts": {
     "test": "cross-conf-env run-with-ganache --ganache-cmd 'npm run ganache' 'npm run truffle compile && npm run truffle migrate && npm run truffle test'",
-    "ganache": "cross-conf-env ganache-cli --gasLimit npm_package_config_gasLimit --account=\"0x0191ecbd1b150b8a3c27c27010ba51b45521689611e669109e034fd66ae69621,9999999999999999999999999999999999999999999\" --account=\"0x00f360233e89c65970a41d4a85990ec6669526b2230e867c352130151453180d,9999999999999999999999999999999999999999999\" --account=\"0x987a26abca7432016104ce2f24ce639340e25afe06ac69f68791399e7a5d1028,9999999999999999999999999999999999999999999\"    --account=\"0x89af34b1b7347834048b99423dad174a14bf14540d720d72c16ae92e94b987cb,9999999999999999999999999999999999999999999\" --account=\"0xc867be647eb2bc51e4c0d61066859875cf3634fe949b6f5f85c69ab90e485b37,9999999999999999999999999999999999999999999\" --account=\"0xefabcc2377dee5e51b5a9e65a3854aec85fbbec3cb584d8ad4f9679869fb33c6,9999999999999999999999999999999999999999999\"",
+    "ganache": "cross-conf-env ganache-cli --gasLimit npm_package_config_gasLimit --account=\"0x0191ecbd1b150b8a3c27c27010ba51b45521689611e669109e034fd66ae69621,0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff\" --account=\"0x00f360233e89c65970a41d4a85990ec6669526b2230e867c352130151453180d,9999999999999999999999999999999999999999999\" --account=\"0x987a26abca7432016104ce2f24ce639340e25afe06ac69f68791399e7a5d1028,9999999999999999999999999999999999999999999\"    --account=\"0x89af34b1b7347834048b99423dad174a14bf14540d720d72c16ae92e94b987cb,9999999999999999999999999999999999999999999\" --account=\"0xc867be647eb2bc51e4c0d61066859875cf3634fe949b6f5f85c69ab90e485b37,9999999999999999999999999999999999999999999\" --account=\"0xefabcc2377dee5e51b5a9e65a3854aec85fbbec3cb584d8ad4f9679869fb33c6,9999999999999999999999999999999999999999999\"",
     "start": "pm2 start truffle -- serve",
     "lint": "eslint .",
     "lint --fix": "eslint --fix .",
diff --git a/test/lockingeth4reputation.js b/test/lockingeth4reputation.js
index 614b8bfc..766eed01 100644
--- a/test/lockingeth4reputation.js
+++ b/test/lockingeth4reputation.js
@@ -61,6 +61,20 @@ contract('LockingEth4Reputation', accounts => {
 
     });
 
+    it("score too high", async () => {
+      let testSetup = await setup(accounts);
+      let BigNumber = require('bignumber.js');
+      BigNumber.set({ DECIMAL_PLACES: 0, ROUNDING_MODE: 4 });
+      let maxUint = ((new BigNumber(2)).toPower(256).sub(1)).div(100).add(1);
+      try {
+        await testSetup.lockingEth4Reputation.lock(1,{value:maxUint.toString(10)});
+        assert(false, "score too high should revert");
+      } catch(error) {
+        helpers.assertVMException(error);
+      }
+
+    });
+
     it("cannot lock without initialize", async () => {
       let testSetup = await setup(accounts,100,0,3000,3000,6000,false);
       try {