diff --git a/lib/pool.js b/lib/pool.js
index bba0454d7..93366d280 100644
--- a/lib/pool.js
+++ b/lib/pool.js
@@ -44,6 +44,8 @@ var shareTrustMinFloat = shareTrustEnabled ? config.poolServer.shareTrust.min /
 
 var banningEnabled = config.poolServer.banning && config.poolServer.banning.enabled;
 
+var addressBase58Prefix = cnUtil.address_decode(new Buffer(config.poolServer.poolAddress));
+
 
 setInterval(function(){
     var now = Date.now() / 1000 | 0;
@@ -440,7 +442,7 @@ function handleMinerMethod(method, params, ip, portData, sendReply, pushMessage)
                 sendReply('missing login');
                 return;
             }
-            if (!utils.isValidAddress(params.login, config.poolServer.poolAddress[0])){
+            if (addressBase58Prefix !== cnUtil.address_decode(new Buffer(params.login))) {
                 sendReply('invalid address used for login');
                 return;
             }
diff --git a/lib/utils.js b/lib/utils.js
index bcbdb0cae..f793fd1fc 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -46,17 +46,3 @@ exports.ringBuffer = function(maxSize){
 exports.varIntEncode = function(n){
 
 };
-
-exports.isValidAddress = function(addr, prefix){
-
-    if (addr.length !== 95) return false;
-    if (addr[0] !== prefix) return false;
-    try{
-        var decoded = cnUtil.address_decode(new Buffer(addr));
-        return decoded.length > 0;
-    }
-    catch(e){
-        return false;
-    }
-
-};