diff --git a/Source/Charts/Jobs/ViewPortJob.swift b/Source/Charts/Jobs/ViewPortJob.swift
index c3adcca5c8..5235bfb52b 100644
--- a/Source/Charts/Jobs/ViewPortJob.swift
+++ b/Source/Charts/Jobs/ViewPortJob.swift
@@ -17,11 +17,11 @@ import CoreGraphics
 open class ViewPortJob: NSObject
 {
     internal var point: CGPoint = .zero
-    internal unowned var viewPortHandler: ViewPortHandler
+    internal var viewPortHandler: ViewPortHandler
     internal var xValue = 0.0
     internal var yValue = 0.0
-    internal unowned var transformer: Transformer
-    internal unowned var view: ChartViewBase
+    internal var transformer: Transformer
+    internal var view: ChartViewBase
 
     @objc public init(
         viewPortHandler: ViewPortHandler,