diff --git a/cockatrice/CMakeLists.txt b/cockatrice/CMakeLists.txt
index 2b21dd28..a2b48800 100644
--- a/cockatrice/CMakeLists.txt
+++ b/cockatrice/CMakeLists.txt
@@ -320,6 +320,8 @@ if(WIN32)
     PATTERN "imageformats/qtiff.dll"
     PATTERN "imageformats/qwbmp.dll"
     PATTERN "imageformats/qwebp.dll"
+    PATTERN "mediaservice/dsengine.dll"
+    PATTERN "mediaservice/wmfengine.dll"
     PATTERN "platforms/qdirect2d.dll"
     PATTERN "platforms/qminimal.dll"
     PATTERN "platforms/qoffscreen.dll"
diff --git a/cockatrice/src/soundengine.cpp b/cockatrice/src/soundengine.cpp
index dd79e550..f2918cf5 100644
--- a/cockatrice/src/soundengine.cpp
+++ b/cockatrice/src/soundengine.cpp
@@ -2,10 +2,13 @@
 
 #include "settingscache.h"
 
-#include <QAudioOutput>
 #include <QDir>
 #include <QMediaPlayer>
 
+#if (QT_VERSION >= QT_VERSION_CHECK(6, 0, 0))
+#include <QAudioOutput>
+#endif
+
 #define DEFAULT_THEME_NAME "Default"
 #define TEST_SOUND_FILENAME "player_join"
 
@@ -23,7 +26,7 @@ SoundEngine::~SoundEngine()
 {
     if (player) {
         player->deleteLater();
-        player = 0;
+        player = nullptr;
     }
 }
 
@@ -48,7 +51,7 @@ void SoundEngine::soundEnabledChanged()
     }
 }
 
-void SoundEngine::playSound(QString fileName)
+void SoundEngine::playSound(const QString &fileName)
 {
     if (!player) {
         return;
diff --git a/cockatrice/src/soundengine.h b/cockatrice/src/soundengine.h
index a386cea8..11304874 100644
--- a/cockatrice/src/soundengine.h
+++ b/cockatrice/src/soundengine.h
@@ -15,9 +15,9 @@ class SoundEngine : public QObject
 {
     Q_OBJECT
 public:
-    SoundEngine(QObject *parent = nullptr);
-    ~SoundEngine();
-    void playSound(QString fileName);
+    explicit SoundEngine(QObject *parent = nullptr);
+    ~SoundEngine() override;
+    void playSound(const QString &fileName);
     QStringMap &getAvailableThemes();
 
 private: