diff --git a/CMakeLists.txt b/CMakeLists.txt
index f54ae9bc5e47..3a7412101ff0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -776,20 +776,6 @@ add_library(mixxx-lib STATIC EXCLUDE_FROM_ALL
   src/preferences/settingsmanager.cpp
   src/preferences/upgrade.cpp
   src/recording/recordingmanager.cpp
-  src/qml/asyncimageprovider.cpp
-  src/qml/qmlapplication.cpp
-  src/qml/qmlcontrolproxy.cpp
-  src/qml/qmlconfigproxy.cpp
-  src/qml/qmldlgpreferencesproxy.cpp
-  src/qml/qmleffectmanifestparametersmodel.cpp
-  src/qml/qmleffectsmanagerproxy.cpp
-  src/qml/qmleffectslotproxy.cpp
-  src/qml/qmllibraryproxy.cpp
-  src/qml/qmllibrarytracklistmodel.cpp
-  src/qml/qmlplayermanagerproxy.cpp
-  src/qml/qmlplayerproxy.cpp
-  src/qml/qmlvisibleeffectsmodel.cpp
-  src/qml/qmlwaveformoverview.cpp
   src/skin/legacy/skincontext.cpp
   src/skin/legacy/tooltips.cpp
   src/skin/skinloader.cpp
@@ -904,7 +890,24 @@ add_library(mixxx-lib STATIC EXCLUDE_FROM_ALL
   src/util/workerthreadscheduler.cpp
   src/util/xml.cpp
 )
-if(NOT QT6)
+if(QT6)
+  target_sources(mixxx-lib PRIVATE
+    src/qml/asyncimageprovider.cpp
+    src/qml/qmlapplication.cpp
+    src/qml/qmlcontrolproxy.cpp
+    src/qml/qmlconfigproxy.cpp
+    src/qml/qmldlgpreferencesproxy.cpp
+    src/qml/qmleffectmanifestparametersmodel.cpp
+    src/qml/qmleffectsmanagerproxy.cpp
+    src/qml/qmleffectslotproxy.cpp
+    src/qml/qmllibraryproxy.cpp
+    src/qml/qmllibrarytracklistmodel.cpp
+    src/qml/qmlplayermanagerproxy.cpp
+    src/qml/qmlplayerproxy.cpp
+    src/qml/qmlvisibleeffectsmodel.cpp
+    src/qml/qmlwaveformoverview.cpp
+  )
+else()
   target_sources(mixxx-lib PRIVATE
     src/library/banshee/bansheedbconnection.cpp
     src/library/banshee/bansheefeature.cpp
diff --git a/src/main.cpp b/src/main.cpp
index 0fd5e14140da..64c9eab9ddba 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -10,16 +10,18 @@
 #include "coreservices.h"
 #include "errordialoghandler.h"
 #include "mixxxapplication.h"
-#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
-#include "mixxxmainwindow.h"
-#endif
-#include "qml/qmlapplication.h"
 #include "sources/soundsourceproxy.h"
 #include "util/cmdlineargs.h"
 #include "util/console.h"
 #include "util/logging.h"
 #include "util/versionstore.h"
 
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
+#include "qml/qmlapplication.h"
+#else
+#include "mixxxmainwindow.h"
+#endif
+
 namespace {
 
 // Exit codes
@@ -36,18 +38,14 @@ int runMixxx(MixxxApplication* pApp, const CmdlineArgs& args) {
     CmdlineArgs::Instance().parseForUserFeedback();
 
     int exitCode;
-    // TODO: remove --qml command line option and make QML only available
-    // with Qt6 when Mixxx can build with Qt6.
-#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
-    if (args.getQml()) {
-#endif
+    // This scope ensures that the main window is destroyed *before*
+    // CoreServices is shut down. Otherwise a debug assertion complaining about
+    // leaked COs may be triggered.
+    {
+#if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
         mixxx::qml::QmlApplication qmlApplication(pApp, pCoreServices);
         exitCode = pApp->exec();
-#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
-    } else {
-        // This scope ensures that `MixxxMainWindow` is destroyed *before*
-        // CoreServices is shut down. Otherwise a debug assertion complaining about
-        // leaked COs may be triggered.
+#else
         MixxxMainWindow mainWindow(pCoreServices);
         pApp->processEvents();
         pApp->installEventFilter(&mainWindow);
@@ -70,8 +68,8 @@ int runMixxx(MixxxApplication* pApp, const CmdlineArgs& args) {
             qDebug() << "Running Mixxx";
             exitCode = pApp->exec();
         }
-    }
 #endif
+    }
     return exitCode;
 }
 
diff --git a/src/util/cmdlineargs.cpp b/src/util/cmdlineargs.cpp
index 1fe6d1cc04f5..a3b87f7035a0 100644
--- a/src/util/cmdlineargs.cpp
+++ b/src/util/cmdlineargs.cpp
@@ -189,12 +189,6 @@ bool CmdlineArgs::parse(const QStringList& arguments, CmdlineArgs::ParseMode mod
                             : QString());
     parser.addOption(developer);
 
-    const QCommandLineOption qml(QStringLiteral("qml"),
-            forUserFeedback ? QCoreApplication::translate("CmdlineArgs",
-                                      "Loads experimental QML GUI instead of legacy QWidget skin")
-                            : QString());
-    parser.addOption(qml);
-
     const QCommandLineOption safeMode(QStringLiteral("safe-mode"),
             forUserFeedback ? QCoreApplication::translate("CmdlineArgs",
                                       "Enables safe-mode. Disables OpenGL waveforms, and "
@@ -327,7 +321,6 @@ bool CmdlineArgs::parse(const QStringList& arguments, CmdlineArgs::ParseMode mod
 
     m_midiDebug = parser.isSet(controllerDebug) || parser.isSet(controllerDebugDeprecated);
     m_developer = parser.isSet(developer);
-    m_qml = parser.isSet(qml);
     m_safeMode = parser.isSet(safeMode) || parser.isSet(safeModeDeprecated);
     m_debugAssertBreak = parser.isSet(debugAssertBreak) || parser.isSet(debugAssertBreakDeprecated);
 
diff --git a/src/util/cmdlineargs.h b/src/util/cmdlineargs.h
index 331ecdce8adf..485e75ee9f35 100644
--- a/src/util/cmdlineargs.h
+++ b/src/util/cmdlineargs.h
@@ -33,9 +33,6 @@ class CmdlineArgs final {
     bool getStartInFullscreen() const { return m_startInFullscreen; }
     bool getMidiDebug() const { return m_midiDebug; }
     bool getDeveloper() const { return m_developer; }
-    bool getQml() const {
-        return m_qml;
-    }
     bool getSafeMode() const { return m_safeMode; }
     bool useColors() const {
         return m_useColors;
@@ -72,7 +69,6 @@ class CmdlineArgs final {
     bool m_startInFullscreen;       // Start in fullscreen mode
     bool m_midiDebug;
     bool m_developer; // Developer Mode
-    bool m_qml;
     bool m_safeMode;
     bool m_debugAssertBreak;
     bool m_settingsPathSet; // has --settingsPath been set on command line ?