diff --git a/src/util/externalcommand.cpp b/src/util/externalcommand.cpp
index 0f4a629..2514294 100644
--- a/src/util/externalcommand.cpp
+++ b/src/util/externalcommand.cpp
@@ -54,6 +54,7 @@ struct ExternalCommandPrivate
     QByteArray m_Output;
     QByteArray m_Input;
     DBusThread *m_thread;
+    QProcess::ProcessChannelMode processChannelMode;
 };
 
 unsigned int ExternalCommand::counter = 0;
@@ -81,7 +82,7 @@ ExternalCommand::ExternalCommand(const QString& cmd, const QStringList& args, co
         if(!startHelper())
             Log(Log::Level::error) << xi18nc("@info:status", "Could not obtain administrator privileges.");
 
-    setup(processChannelMode);
+    d->processChannelMode = processChannelMode;
 }
 
 /** Creates a new ExternalCommand instance with Report.
@@ -98,20 +99,18 @@ ExternalCommand::ExternalCommand(Report& report, const QString& cmd, const QStri
     d->m_ExitCode = -1;
     d->m_Output = QByteArray();
 
-    setup(processChannelMode);
+    d->processChannelMode = processChannelMode;
 }
 
 ExternalCommand::~ExternalCommand()
 {
 }
 
-void ExternalCommand::setup(const QProcess::ProcessChannelMode processChannelMode)
-{
-//     d->arguments.insert(QStringLiteral("processChannelMode"), processChannelMode); // FIXME
-
+// void ExternalCommand::setup()
+// {
 //     connect(this, qOverload<int, QProcess::ExitStatus>(&QProcess::finished), this, &ExternalCommand::onFinished);
 //     connect(this, &ExternalCommand::readyReadStandardOutput, this, &ExternalCommand::onReadOutput);
-}
+// }
 
 /** Executes the external command.
     @param timeout timeout to wait for the process to start
@@ -150,6 +149,7 @@ bool ExternalCommand::start(int timeout)
         for (const auto &argument : qAsConst(d->m_Args))
             request.append(argument.toUtf8());
         request.append(d->m_Input);
+        request.append(d->processChannelMode);
 
         QByteArray hash = QCryptographicHash::hash(request, QCryptographicHash::Sha512);
 
@@ -157,7 +157,8 @@ bool ExternalCommand::start(int timeout)
                                                  privateKey->signMessage(hash, QCA::EMSA3_Raw),
                                                  cmd,
                                                  args(),
-                                                 d->m_Input);
+                                                 d->m_Input,
+                                                 d->processChannelMode);
 
         QDBusPendingCallWatcher *watcher = new QDBusPendingCallWatcher(pcall, this);
 
diff --git a/src/util/externalcommand.h b/src/util/externalcommand.h
index 069640b..9f24c9f 100644
--- a/src/util/externalcommand.h
+++ b/src/util/externalcommand.h
@@ -126,7 +126,6 @@ public Q_SLOTS:
 
 private:
     void setExitCode(int i);
-    void setup(const QProcess::ProcessChannelMode processChannelMode);
 
     void onFinished(int exitCode, QProcess::ExitStatus exitStatus);
     void onReadOutput();
diff --git a/src/util/externalcommandhelper.cpp b/src/util/externalcommandhelper.cpp
index a1d2b87..e12cccc 100644
--- a/src/util/externalcommandhelper.cpp
+++ b/src/util/externalcommandhelper.cpp
@@ -244,7 +244,7 @@ bool ExternalCommandHelper::copyblocks(const QByteArray& signature, const QStrin
     return rval;
 }
 
-QVariantMap ExternalCommandHelper::start(const QByteArray& signature, const QString& command, const QStringList& arguments, const QByteArray& input)
+QVariantMap ExternalCommandHelper::start(const QByteArray& signature, const QString& command, const QStringList& arguments, const QByteArray& input, const int processChannelMode)
 {
     QTextCodec::setCodecForLocale(QTextCodec::codecForName("UTF-8"));
     QVariantMap reply;
@@ -255,6 +255,7 @@ QVariantMap ExternalCommandHelper::start(const QByteArray& signature, const QStr
     for (const auto &argument : arguments)
         request.append(argument.toUtf8());
     request.append(input);
+    request.append(processChannelMode);
     QByteArray hash = QCryptographicHash::hash(request, QCryptographicHash::Sha512);
     if (!m_publicKey.verifyMessage(hash, signature, QCA::EMSA3_Raw)) {
         qCritical() << xi18n("Invalid cryptographic signature");
@@ -265,6 +266,7 @@ QVariantMap ExternalCommandHelper::start(const QByteArray& signature, const QStr
 //     connect(&cmd, &QProcess::readyReadStandardOutput, this, &ExternalCommandHelper::onReadOutput);
 
     m_cmd.setEnvironment( { QStringLiteral("LVM_SUPPRESS_FD_WARNINGS=1") } );
+    m_cmd.setProcessChannelMode(static_cast<QProcess::ProcessChannelMode>(processChannelMode));
     m_cmd.start(command, arguments);
     m_cmd.write(input);
     m_cmd.closeWriteChannel();
diff --git a/src/util/externalcommandhelper.h b/src/util/externalcommandhelper.h
index 818c76c..60453ef 100644
--- a/src/util/externalcommandhelper.h
+++ b/src/util/externalcommandhelper.h
@@ -43,7 +43,7 @@ public:
 
 public Q_SLOTS:
     ActionReply init(const QVariantMap& args);
-    Q_SCRIPTABLE QVariantMap start(const QByteArray& signature, const QString& command, const QStringList& arguments, const QByteArray& input);
+    Q_SCRIPTABLE QVariantMap start(const QByteArray& signature, const QString& command, const QStringList& arguments, const QByteArray& input, const int processChannelMode);
     Q_SCRIPTABLE bool copyblocks(const QByteArray& signature, const QString& sourceDevice, const qint64 sourceFirstByte, const qint64 sourceLength, const QString& targetDevice, const qint64 targetFirstByte, const qint64 blockSize);
     Q_SCRIPTABLE void exit(const QByteArray& signature);