diff --git a/lib/jobManager.js b/lib/jobManager.js
index 4ce9317..dd320a5 100644
--- a/lib/jobManager.js
+++ b/lib/jobManager.js
@@ -125,7 +125,7 @@ var JobManager = module.exports = function JobManager(maxDifficulty, hashDigest,
 
     };
 
-    this.processShare = function(jobId, difficulty, extraNonce1, extraNonce2, nTime, nonce, ipAddress, workerName){
+    this.processShare = function(jobId, previousDifficulty, difficulty, extraNonce1, extraNonce2, nTime, nonce, ipAddress, workerName){
         var shareError = function(error){
             _this.emit('share', {
                 job: jobId,
@@ -190,8 +190,15 @@ var JobManager = module.exports = function JobManager(maxDifficulty, hashDigest,
         else {
             var targetUser = maxDifficulty.div(difficulty);
             if (headerBigNum.gt(targetUser)){
-                var shareDiff = maxDifficulty.div(headerBigNum).toString();
-                return shareError([23, 'low difficulty share of ' + shareDiff]);
+                //Check if share matched a previous difficulty from before vardiff retarget
+                if (previousDifficulty && !headerBigNum.gt(maxDifficulty.div(previousDifficulty))){
+                    difficulty = previousDifficulty;
+                }
+                else{
+                    var shareDiff = maxDifficulty.div(headerBigNum).toString();
+                    return shareError([23, 'low difficulty share of ' + shareDiff]);
+                }
+
             }
         }
         if (!!blockHex) {
diff --git a/lib/pool.js b/lib/pool.js
index 58d5c43..f1127b6 100644
--- a/lib/pool.js
+++ b/lib/pool.js
@@ -553,6 +553,7 @@ var pool = module.exports = function pool(options, authorizeFn){
             }).on('submit', function(params, resultCallback){
                 var result =_this.jobManager.processShare(
                     params.jobId,
+                    client.previousDifficulty,
                     client.difficulty,
                     client.extraNonce1,
                     params.extraNonce2,
diff --git a/lib/stratum.js b/lib/stratum.js
index 47f039e..3b9c272 100644
--- a/lib/stratum.js
+++ b/lib/stratum.js
@@ -240,6 +240,7 @@ var StratumClient = function(options){
         if (difficulty === this.difficulty)
             return false;
 
+        _this.previousDifficulty = _this.difficulty;
         _this.difficulty = difficulty;
         sendJson({
             id    : null,