diff --git a/src/plugins/debugger/debuggerruncontrol.cpp b/src/plugins/debugger/debuggerruncontrol.cpp
index 741a295af2d..b9c829a27d4 100644
--- a/src/plugins/debugger/debuggerruncontrol.cpp
+++ b/src/plugins/debugger/debuggerruncontrol.cpp
@@ -477,16 +477,16 @@ void DebuggerRunTool::setCoreFileName(const QString &coreFile, bool isSnapshot)
 
 void DebuggerRunTool::appendInferiorCommandLineArgument(const QString &arg)
 {
-    if (!m_runParameters.inferior.commandLineArguments.isEmpty())
-        m_runParameters.inferior.commandLineArguments.append(' ');
-    m_runParameters.inferior.commandLineArguments.append(arg);
+    QtcProcess::addArg(&m_runParameters.inferior.commandLineArguments, arg,
+                       device() ? device()->osType() : HostOsInfo::hostOs());
 }
 
 void DebuggerRunTool::prependInferiorCommandLineArgument(const QString &arg)
 {
     if (!m_runParameters.inferior.commandLineArguments.isEmpty())
         m_runParameters.inferior.commandLineArguments.prepend(' ');
-    m_runParameters.inferior.commandLineArguments.prepend(arg);
+    m_runParameters.inferior.commandLineArguments.prepend(
+                QtcProcess::quoteArg(arg, device() ? device()->osType() : HostOsInfo::hostOs()));
 }
 
 void DebuggerRunTool::addQmlServerInferiorCommandLineArgumentIfNeeded()
diff --git a/src/plugins/qmlprofiler/qmlprofilerruncontrol.cpp b/src/plugins/qmlprofiler/qmlprofilerruncontrol.cpp
index ff828ae11e5..e813ce0e612 100644
--- a/src/plugins/qmlprofiler/qmlprofilerruncontrol.cpp
+++ b/src/plugins/qmlprofiler/qmlprofilerruncontrol.cpp
@@ -46,6 +46,7 @@
 
 #include <utils/qtcassert.h>
 #include <utils/qtcfallthrough.h>
+#include <utils/qtcprocess.h>
 #include <utils/url.h>
 
 #include <QMessageBox>
@@ -254,8 +255,8 @@ LocalQmlProfilerSupport::LocalQmlProfilerSupport(QmlProfilerTool *profilerTool,
     else
         QTC_CHECK(false);
 
-    QString arguments = QmlDebug::qmlDebugCommandLineArguments(QmlDebug::QmlProfilerServices,
-                                                               code, true);
+    QString arguments = Utils::QtcProcess::quoteArg(
+                QmlDebug::qmlDebugCommandLineArguments(QmlDebug::QmlProfilerServices, code, true));
 
     if (!debuggee.commandLineArguments.isEmpty())
         arguments += ' ' + debuggee.commandLineArguments;
diff --git a/src/plugins/qmlprofiler/tests/localqmlprofilerrunner_test.cpp b/src/plugins/qmlprofiler/tests/localqmlprofilerrunner_test.cpp
index 007dac486a2..1f2dcce4b2f 100644
--- a/src/plugins/qmlprofiler/tests/localqmlprofilerrunner_test.cpp
+++ b/src/plugins/qmlprofiler/tests/localqmlprofilerrunner_test.cpp
@@ -31,6 +31,7 @@
 #include <qmlprofiler/qmlprofilertool.h>
 
 #include <utils/url.h>
+#include <utils/temporaryfile.h>
 
 #include <QtTest>
 #include <QTcpServer>
@@ -148,6 +149,31 @@ void LocalQmlProfilerRunnerTest::testRunner()
     runControl->initiateFinish();
     QTRY_VERIFY(runControl.isNull());
     QVERIFY(profiler.isNull());
+
+    debuggee.commandLineArguments = QString("-test QmlProfiler,");
+    serverUrl.setScheme(Utils::urlSocketScheme());
+    {
+        Utils::TemporaryFile file("file with spaces");
+        if (file.open())
+            serverUrl.setPath(file.fileName());
+    }
+
+    runControl = new ProjectExplorer::RunControl(nullptr,
+                                                 ProjectExplorer::Constants::QML_PROFILER_RUN_MODE);
+    runControl->setRunnable(debuggee);
+    profiler = new LocalQmlProfilerSupport(&tool, runControl, serverUrl);
+    connectRunner();
+    runControl->initiateStart();
+
+    QTRY_VERIFY_WITH_TIMEOUT(running, 30000);
+    QTRY_VERIFY_WITH_TIMEOUT(!running, 30000);
+    QCOMPARE(startCount, 4);
+    QCOMPARE(stopCount, 4);
+    QCOMPARE(runCount, 3);
+
+    runControl->initiateFinish();
+    QTRY_VERIFY(runControl.isNull());
+    QVERIFY(profiler.isNull());
 }
 
 void LocalQmlProfilerRunnerTest::testFindFreePort()
diff --git a/src/plugins/qnx/qnxanalyzesupport.cpp b/src/plugins/qnx/qnxanalyzesupport.cpp
index 8001327dedd..fa6a61b2672 100644
--- a/src/plugins/qnx/qnxanalyzesupport.cpp
+++ b/src/plugins/qnx/qnxanalyzesupport.cpp
@@ -75,11 +75,10 @@ void QnxQmlProfilerSupport::start()
     serverUrl.setScheme("tcp");
     m_profiler->recordData("QmlServerUrl", serverUrl);
 
-    QString args = QmlDebug::qmlDebugTcpArguments(QmlDebug::QmlProfilerServices, qmlPort);
     auto r = runnable().as<StandardRunnable>();
-    if (!r.commandLineArguments.isEmpty())
-        r.commandLineArguments.append(' ');
-    r.commandLineArguments += args;
+    QtcProcess::addArg(&r.commandLineArguments,
+                       QmlDebug::qmlDebugTcpArguments(QmlDebug::QmlProfilerServices, qmlPort),
+                       device()->osType());
 
     setRunnable(r);
 
diff --git a/src/plugins/remotelinux/remotelinuxqmltoolingsupport.cpp b/src/plugins/remotelinux/remotelinuxqmltoolingsupport.cpp
index 836ab11fd56..933c91f4762 100644
--- a/src/plugins/remotelinux/remotelinuxqmltoolingsupport.cpp
+++ b/src/plugins/remotelinux/remotelinuxqmltoolingsupport.cpp
@@ -28,6 +28,7 @@
 #include <projectexplorer/runnables.h>
 
 #include <ssh/sshconnection.h>
+#include <utils/qtcprocess.h>
 #include <utils/url.h>
 
 using namespace ProjectExplorer;
@@ -66,11 +67,9 @@ void RemoteLinuxQmlToolingSupport::start()
     serverUrl.setPort(qmlPort.number());
     m_runworker->recordData("QmlServerUrl", serverUrl);
 
-    QString args = QmlDebug::qmlDebugTcpArguments(m_services, qmlPort);
     auto r = runnable().as<StandardRunnable>();
-    if (!r.commandLineArguments.isEmpty())
-        r.commandLineArguments.append(' ');
-    r.commandLineArguments += args;
+    QtcProcess::addArg(&r.commandLineArguments, QmlDebug::qmlDebugTcpArguments(m_services, qmlPort),
+                       device()->osType());
 
     setRunnable(r);