diff --git a/src/stratum.cpp b/src/stratum.cpp
index 3d04489..dacaaaf 100644
--- a/src/stratum.cpp
+++ b/src/stratum.cpp
@@ -204,11 +204,10 @@ bool tx_mining_submit(WiFiClient& client, mining_subscribe mWorker, mining_job m
     sprintf(payload, "{\"id\": %u, \"method\": \"mining.submit\", \"params\": [\"%s\",\"%s\",\"%s\",\"%s\",\"%s\"]}\n",
         id,
         mWorker.wName,//"bc1qvv469gmw4zz6qa4u4dsezvrlmqcqszwyfzhgwj", //mWorker.name,
-        mJob.job_id,
-        mWorker.extranonce2,
-        mJob.ntime,
-        String(nonce, HEX),
-        id
+        mJob.job_id.c_str(),
+        mWorker.extranonce2.c_str(),
+        mJob.ntime.c_str(),
+        String(nonce, HEX).c_str()
         );
     Serial.print("  Sending  : "); Serial.print(payload);
     client.print(payload);