diff --git a/src/plugins/autotest/testoutputreader.cpp b/src/plugins/autotest/testoutputreader.cpp
index 693a897e831..639c962b06b 100644
--- a/src/plugins/autotest/testoutputreader.cpp
+++ b/src/plugins/autotest/testoutputreader.cpp
@@ -137,6 +137,13 @@ TestOutputReader::TestOutputReader(const QFutureInterface<TestResultPtr> &future
     , m_buildDir(buildDirectory)
 {
     connect(m_testApplication, &QProcess::readyRead, this, &TestOutputReader::processOutput);
+    connect(m_testApplication, &QProcess::readyReadStandardError,
+            this, &TestOutputReader::processStdError);
+}
+
+void TestOutputReader::processStdError()
+{
+    qWarning() << "Ignored plain output:" << m_testApplication->readAllStandardError();
 }
 
 QtTestOutputReader::QtTestOutputReader(const QFutureInterface<TestResultPtr> &futureInterface,
diff --git a/src/plugins/autotest/testoutputreader.h b/src/plugins/autotest/testoutputreader.h
index 1c557d9dd74..facb69b6014 100644
--- a/src/plugins/autotest/testoutputreader.h
+++ b/src/plugins/autotest/testoutputreader.h
@@ -49,6 +49,7 @@ public:
 
 protected:
     virtual void processOutput() = 0;
+    virtual void processStdError();
     QFutureInterface<TestResultPtr> m_futureInterface;
     QProcess *m_testApplication;  // not owned
     QString m_buildDir;
diff --git a/src/plugins/autotest/testrunner.cpp b/src/plugins/autotest/testrunner.cpp
index c82bf911c83..9d412ec4476 100644
--- a/src/plugins/autotest/testrunner.cpp
+++ b/src/plugins/autotest/testrunner.cpp
@@ -137,7 +137,6 @@ static void performTestRun(QFutureInterface<TestResultPtr> &futureInterface,
     }
 
     QProcess testProcess;
-    testProcess.setReadChannelMode(QProcess::MergedChannels);
     testProcess.setReadChannel(QProcess::StandardOutput);
 
     futureInterface.setProgressRange(0, testCaseCount);