diff --git a/app/src/main/kotlin/de/rochefort/childmonitor/ListenActivity.kt b/app/src/main/kotlin/de/rochefort/childmonitor/ListenActivity.kt
index 14501d6..f823f35 100644
--- a/app/src/main/kotlin/de/rochefort/childmonitor/ListenActivity.kt
+++ b/app/src/main/kotlin/de/rochefort/childmonitor/ListenActivity.kt
@@ -47,7 +47,7 @@ class ListenActivity : Activity() {
             val connectedText = findViewById<TextView>(R.id.connectedTo)
             connectedText.text = bs.childDeviceName
             val volumeView = findViewById<VolumeView>(R.id.volume)
-            volumeView.setVolumeHistory(bs.volumeHistory)
+            volumeView.volumeHistory = bs.volumeHistory
             bs.setUpdateCallback { volumeView.postInvalidate() }
             bs.setErrorCallback { postErrorMessage() }
         }
diff --git a/app/src/main/kotlin/de/rochefort/childmonitor/VolumeView.kt b/app/src/main/kotlin/de/rochefort/childmonitor/VolumeView.kt
index 67d6b95..3df2323 100644
--- a/app/src/main/kotlin/de/rochefort/childmonitor/VolumeView.kt
+++ b/app/src/main/kotlin/de/rochefort/childmonitor/VolumeView.kt
@@ -26,7 +26,7 @@ import kotlin.math.min
 
 class VolumeView : View {
     private val paint: Paint
-    private var volumeHistory: VolumeHistory? = null
+    public var volumeHistory: VolumeHistory? = null
 
     constructor(context: Context?) : super(context) {
         paint = initPaint()
@@ -85,8 +85,4 @@ class VolumeView : View {
             yPrev = yNext
         }
     }
-
-    fun setVolumeHistory(volumeHistory: VolumeHistory?) {
-        this.volumeHistory = volumeHistory
-    }
 }