diff --git a/lib/pool.js b/lib/pool.js
index 88abbbf..e2482af 100644
--- a/lib/pool.js
+++ b/lib/pool.js
@@ -398,10 +398,12 @@ var pool = module.exports = function pool(options, authorizeFn){
                 return;
             }
 
-            if (isNaN(rpcResults.getdifficulty) && 'proof-of-stake' in rpcResults.getdifficulty)
-                options.coin.reward = 'POS';
-            else
-                options.coin.reward = 'POW';
+            if (!options.coin.reward) {
+                if (isNaN(rpcResults.getdifficulty) && 'proof-of-stake' in rpcResults.getdifficulty)
+                    options.coin.reward = 'POS';
+                else
+                    options.coin.reward = 'POW';
+            }
 
 
             /* POS coins must use the pubkey in coinbase transaction, and pubkey is