diff --git a/src/apps/soundrecorder/VUView.cpp b/src/apps/soundrecorder/VUView.cpp
index ad356cbdae..c90afc5e2f 100644
--- a/src/apps/soundrecorder/VUView.cpp
+++ b/src/apps/soundrecorder/VUView.cpp
@@ -175,10 +175,10 @@ VUView::_RenderLoop()
 
 template<typename T>
 T 
-VUView::_ComputeNextLevel(void *data, size_t size, uint32 format, 
+VUView::_ComputeNextLevel(const void *data, size_t size, uint32 format, 
 	int32 channel)
 {
-	T* samp = (T*)data;
+	const T* samp = (const T*)data;
 	
 	// get the min and max values in the nibbling interval
 	// and set max to be the greater of the absolute value
@@ -199,7 +199,7 @@ VUView::_ComputeNextLevel(void *data, size_t size, uint32 format,
 
 
 void
-VUView::ComputeLevels(void* data, size_t size, uint32 format)
+VUView::ComputeLevels(const void* data, size_t size, uint32 format)
 {
 	for (int32 channel = 0; channel < fChannels; channel++) {
 		switch (format) {
diff --git a/src/apps/soundrecorder/VUView.h b/src/apps/soundrecorder/VUView.h
index 4784c11992..84f01462ad 100644
--- a/src/apps/soundrecorder/VUView.h
+++ b/src/apps/soundrecorder/VUView.h
@@ -21,14 +21,14 @@ public:
 	void AttachedToWindow();
 	void DetachedFromWindow();
 	void Draw(BRect updateRect);
-	void ComputeLevels(void* data, size_t size, uint32 format);
+	void ComputeLevels(const void* data, size_t size, uint32 format);
 			
 private:
 	void _Run();
 	void _Quit();
 	static int32 _RenderLaunch(void *data);
 	void _RenderLoop();
-	template<typename T> T _ComputeNextLevel(void *data, 
+	template<typename T> T _ComputeNextLevel(const void *data, 
 		size_t size, uint32 format, int32 channel);
 	
 	thread_id fThreadId;