diff --git a/src/ippmsg.cpp b/src/ippmsg.cpp
index ffbbe0c..38869e9 100644
--- a/src/ippmsg.cpp
+++ b/src/ippmsg.cpp
@@ -6,8 +6,9 @@ IppMsg::IppMsg()
 {
 }
 
-IppMsg::IppMsg(QJsonObject opAttrs, QJsonObject jobAttrs, quint8 majVsn, quint8 minVsn)
+IppMsg::IppMsg(Operation operation, QJsonObject opAttrs, QJsonObject jobAttrs, quint8 majVsn, quint8 minVsn)
 {
+    _operation = operation;
     _majVsn = majVsn;
     _minVsn = minVsn;
     _opAttrs = opAttrs;
@@ -302,13 +303,13 @@ QString IppMsg::consume_attribute(QJsonObject& attrs, Bytestream& data)
     return name;
 }
 
-Bytestream IppMsg::encode(Operation op)
+Bytestream IppMsg::encode()
 {
     Bytestream ipp;
 
     ipp << _majVsn << _minVsn;
 
-    ipp << quint16(op);
+    ipp << quint16(_operation);
     ipp << _reqid++;
 
 
diff --git a/src/ippmsg.h b/src/ippmsg.h
index baee69a..1b33ae2 100644
--- a/src/ippmsg.h
+++ b/src/ippmsg.h
@@ -67,11 +67,11 @@ public:
 
     explicit IppMsg();
     explicit IppMsg(Bytestream& resp);
-    IppMsg(QJsonObject opAttrs, QJsonObject jobAttrs=QJsonObject(), quint8 majVsn=1, quint8 minVsn=1);
+    IppMsg(Operation operation, QJsonObject opAttrs, QJsonObject jobAttrs=QJsonObject(), quint8 majVsn=1, quint8 minVsn=1);
     IppMsg(const IppMsg& other) = default;
     ~IppMsg();
 
-    Bytestream encode(Operation op);
+    Bytestream encode();
     QJsonObject getPrinterAttrs() {return _printerAttrs;}
     QJsonArray getJobAttrs() {return _jobAttrs;}
     QJsonObject getOpAttrs() {return _opAttrs;}
@@ -87,6 +87,8 @@ private:
     QString consume_attribute(QJsonObject& attrs, Bytestream& data);
     void encode_attr(Bytestream& msg, quint8 tag, QString name, QJsonValue value, bool subCollection=false);
 
+    Operation _operation;
+
     quint8 _majVsn;
     quint8 _minVsn;
 
diff --git a/src/ippprinter.cpp b/src/ippprinter.cpp
index dc6647b..3a61913 100644
--- a/src/ippprinter.cpp
+++ b/src/ippprinter.cpp
@@ -132,8 +132,8 @@ void IppPrinter::refresh() {
     {
         QJsonObject o = opAttrs();
 
-        IppMsg msg = IppMsg(o);
-        emit doDoGetPrinterAttributes(msg.encode(IppMsg::GetPrinterAttrs));
+        IppMsg msg = IppMsg(IppMsg::GetPrinterAttrs, o);
+        emit doDoGetPrinterAttributes(msg.encode());
     }
 }
 
@@ -705,7 +705,6 @@ void IppPrinter::print(QJsonObject jobAttrs, QString filename)
     qDebug() << "Final op attributes:" << o;
     qDebug() << "Final job attributes:" << jobAttrs;
 
-    IppMsg job = mk_msg(o, jobAttrs);
 
     QString Sides = getAttrOrDefault(jobAttrs, "sides").toString();
 
@@ -719,6 +718,7 @@ void IppPrinter::print(QJsonObject jobAttrs, QString filename)
         Params.tumble = true;
     }
 
+    IppMsg job = mk_msg(IppMsg::PrintJob, o, jobAttrs);
     emit doPrint(filename, mimeType, targetFormat, job, Params, margins);
 }
 
@@ -728,9 +728,9 @@ bool IppPrinter::getJobs() {
     QJsonObject o = opAttrs();
     o.insert("requested-attributes", QJsonObject {{"tag", IppMsg::Keyword}, {"value", "all"}});
 
-    IppMsg job = IppMsg(o, QJsonObject());
+    IppMsg job = IppMsg(IppMsg::GetJobs, o, QJsonObject());
 
-    emit doGetJobs(job.encode(IppMsg::GetJobs));
+    emit doGetJobs(job.encode());
 
     return true;
 }
@@ -742,9 +742,9 @@ bool IppPrinter::cancelJob(qint32 jobId) {
     QJsonObject o = opAttrs();
     o.insert("job-id", QJsonObject {{"tag", IppMsg::Integer}, {"value", jobId}});
 
-    IppMsg job = IppMsg(o, QJsonObject());
+    IppMsg job = IppMsg(IppMsg::CancelJob, o, QJsonObject());
 
-    emit doCancelJob(job.encode(IppMsg::CancelJob));
+    emit doCancelJob(job.encode());
 
     return true;
 }
@@ -755,9 +755,9 @@ bool IppPrinter::identify() {
 
     QJsonObject o = opAttrs();
 
-    IppMsg job = IppMsg(o, QJsonObject());
+    IppMsg job = IppMsg(IppMsg::IdentifyPrinter, o, QJsonObject());
 
-    emit doCancelJob(job.encode(IppMsg::IdentifyPrinter));
+    emit doCancelJob(job.encode());
 
     return true;
 }
@@ -860,15 +860,15 @@ QJsonValue IppPrinter::getAttrOrDefault(QJsonObject jobAttrs, QString name, QStr
     }
 }
 
-IppMsg IppPrinter::mk_msg(QJsonObject opAttrs, QJsonObject jobAttrs)
+IppMsg IppPrinter::mk_msg(IppMsg::Operation operation, QJsonObject opAttrs, QJsonObject jobAttrs)
 {
     if(_attrs.contains("ipp-versions-supported") &&
        _attrs["ipp-versions-supported"].toObject()["value"].toArray().contains("2.0"))
     {
         qDebug() << "TWO-POINT-ZERO";
-        return IppMsg(opAttrs, jobAttrs, 2, 0);
+        return IppMsg(operation, opAttrs, jobAttrs, 2, 0);
     }
-    return IppMsg(opAttrs, jobAttrs);
+    return IppMsg(operation, opAttrs, jobAttrs);
 }
 
 void IppPrinter::resolveUrl(QUrl& url)
diff --git a/src/ippprinter.h b/src/ippprinter.h
index a2df94c..aa56741 100644
--- a/src/ippprinter.h
+++ b/src/ippprinter.h
@@ -116,7 +116,7 @@ private:
 
     QJsonValue getAttrOrDefault(QJsonObject jobAttrs, QString name, QString subkey = "");
 
-    IppMsg mk_msg(QJsonObject opAttrs, QJsonObject jobAttrs=QJsonObject());
+    IppMsg mk_msg(IppMsg::Operation operation, QJsonObject opAttrs, QJsonObject jobAttrs=QJsonObject());
 
     QJsonObject _attrs;
     QJsonObject _jobAttrs;
diff --git a/src/printerworker.cpp b/src/printerworker.cpp
index 94752b9..c4f8f5e 100644
--- a/src/printerworker.cpp
+++ b/src/printerworker.cpp
@@ -69,7 +69,7 @@ void PrinterWorker::print(QString filename, QString mimeType, QString targetForm
     try {
         Mimer* mimer = Mimer::instance();
 
-        Bytestream contents = job.encode(IppMsg::PrintJob);
+        Bytestream contents = job.encode();
 
         emit busyMessage(tr("Preparing"));