diff --git a/Userland/Applications/SoundPlayer/SampleWidget.cpp b/Userland/Applications/SoundPlayer/SampleWidget.cpp
index b3884a175a..041f66e0e3 100644
--- a/Userland/Applications/SoundPlayer/SampleWidget.cpp
+++ b/Userland/Applications/SoundPlayer/SampleWidget.cpp
@@ -73,7 +73,7 @@ void SampleWidget::paint_event(GUI::PaintEvent& event)
     }
 }
 
-void SampleWidget::set_buffer(Audio::Buffer* buffer)
+void SampleWidget::set_buffer(RefPtr<Audio::Buffer> buffer)
 {
     if (m_buffer == buffer)
         return;
diff --git a/Userland/Applications/SoundPlayer/SampleWidget.h b/Userland/Applications/SoundPlayer/SampleWidget.h
index 7da9c20b38..a89f5ff700 100644
--- a/Userland/Applications/SoundPlayer/SampleWidget.h
+++ b/Userland/Applications/SoundPlayer/SampleWidget.h
@@ -26,18 +26,20 @@
 
 #pragma once
 
+#include "VisualizationBase.h"
 #include <LibGUI/Frame.h>
 
 namespace Audio {
 class Buffer;
 }
 
-class SampleWidget final : public GUI::Frame {
+class SampleWidget final : public GUI::Frame
+    , public Visualization {
     C_OBJECT(SampleWidget)
 public:
     virtual ~SampleWidget() override;
 
-    void set_buffer(Audio::Buffer*);
+    void set_buffer(RefPtr<Audio::Buffer>) override;
 
 private:
     SampleWidget();