diff --git a/Source/Charts/Charts/PieChartView.swift b/Source/Charts/Charts/PieChartView.swift
index 704c066bdf..b718d9a413 100644
--- a/Source/Charts/Charts/PieChartView.swift
+++ b/Source/Charts/Charts/PieChartView.swift
@@ -110,7 +110,7 @@ open class PieChartView: PieRadarChartViewBase
         
         if (valuesToHighlight())
         {
-            renderer.drawHighlighted(context: context, indices: highlighted)
+            renderer.drawHighlighted(context: context, indices: highlighted.compactMap { $0 })
         }
         
         renderer.drawExtras(context: context)