diff --git a/Charts/Classes/Charts/BarLineChartViewBase.swift b/Charts/Classes/Charts/BarLineChartViewBase.swift
index f6abb0a916..ec967c0d37 100644
--- a/Charts/Classes/Charts/BarLineChartViewBase.swift
+++ b/Charts/Classes/Charts/BarLineChartViewBase.swift
@@ -74,7 +74,7 @@ public class BarLineChartViewBase: ChartViewBase, UIGestureRecognizerDelegate
         super.init(frame: frame)
     }
     
-    public required init(coder aDecoder: NSCoder)
+    public required init?(coder aDecoder: NSCoder)
     {
         super.init(coder: aDecoder)
     }
diff --git a/Charts/Classes/Charts/ChartViewBase.swift b/Charts/Classes/Charts/ChartViewBase.swift
index 83583ee32d..7f78511e51 100755
--- a/Charts/Classes/Charts/ChartViewBase.swift
+++ b/Charts/Classes/Charts/ChartViewBase.swift
@@ -145,7 +145,7 @@ public class ChartViewBase: UIView, ChartAnimatorDelegate
         initialize()
     }
     
-    public required init(coder aDecoder: NSCoder)
+    public required init?(coder aDecoder: NSCoder)
     {
         super.init(coder: aDecoder)
         initialize()
diff --git a/Charts/Classes/Charts/PieChartView.swift b/Charts/Classes/Charts/PieChartView.swift
index 0c47368d9f..ac0de4b3bb 100755
--- a/Charts/Classes/Charts/PieChartView.swift
+++ b/Charts/Classes/Charts/PieChartView.swift
@@ -31,7 +31,7 @@ public class PieChartView: PieRadarChartViewBase
         super.init(frame: frame)
     }
     
-    public required init(coder aDecoder: NSCoder)
+    public required init?(coder aDecoder: NSCoder)
     {
         super.init(coder: aDecoder)
     }
diff --git a/Charts/Classes/Charts/PieRadarChartViewBase.swift b/Charts/Classes/Charts/PieRadarChartViewBase.swift
index 0974b2c07b..a90d66a17d 100755
--- a/Charts/Classes/Charts/PieRadarChartViewBase.swift
+++ b/Charts/Classes/Charts/PieRadarChartViewBase.swift
@@ -37,7 +37,7 @@ public class PieRadarChartViewBase: ChartViewBase
         super.init(frame: frame)
     }
     
-    public required init(coder aDecoder: NSCoder)
+    public required init?(coder aDecoder: NSCoder)
     {
         super.init(coder: aDecoder)
     }
diff --git a/Charts/Classes/Charts/RadarChartView.swift b/Charts/Classes/Charts/RadarChartView.swift
index 2282509554..49363e4e93 100644
--- a/Charts/Classes/Charts/RadarChartView.swift
+++ b/Charts/Classes/Charts/RadarChartView.swift
@@ -51,7 +51,7 @@ public class RadarChartView: PieRadarChartViewBase
         super.init(frame: frame)
     }
     
-    public required init(coder aDecoder: NSCoder)
+    public required init?(coder aDecoder: NSCoder)
     {
         super.init(coder: aDecoder)
     }