diff --git a/example/animated_radial_chart_example.dart b/example/animated_radial_chart_example.dart
index f7d83f3..560c9ff 100644
--- a/example/animated_radial_chart_example.dart
+++ b/example/animated_radial_chart_example.dart
@@ -98,7 +98,7 @@ class _AnimatedRadialChartExampleState
               size: _chartSize,
               initialChartData: _generateChartData(value),
               chartType: CircularChartType.Radial,
-              edgeStyle: SegmentEdgeStyle.Round,
+              edgeStyle: SegmentEdgeStyle.round,
               percentageValues: true,
               holeLabel: '$value%',
               labelStyle: _labelStyle,
diff --git a/lib/src/animated_circular_chart.dart b/lib/src/animated_circular_chart.dart
index 265e09f..17e0af0 100644
--- a/lib/src/animated_circular_chart.dart
+++ b/lib/src/animated_circular_chart.dart
@@ -17,10 +17,10 @@ enum CircularChartType {
 /// Determines how the ends of a chart's segments should be drawn.
 enum SegmentEdgeStyle {
   /// Segments begin and end with a flat edge.
-  Flat,
+  flat,
 
   /// Segments begin and end with a semi-circle.
-  Round,
+  round,
 }
 
 class AnimatedCircularChart extends StatefulWidget {
@@ -35,7 +35,7 @@ class AnimatedCircularChart extends StatefulWidget {
     this.startAngle = _kStartAngle,
     this.holeLabel,
     this.labelStyle,
-    this.edgeStyle = SegmentEdgeStyle.Flat,
+    this.edgeStyle = SegmentEdgeStyle.flat,
   })  : assert(size != null),
         super(key: key);
 
@@ -102,7 +102,7 @@ class AnimatedCircularChart extends StatefulWidget {
 
   /// The type of segment edges to be drawn.
   ///
-  /// Defaults to [SegmentEdgeStyle.Flat].
+  /// Defaults to [SegmentEdgeStyle.flat].
   final SegmentEdgeStyle edgeStyle;
 
   /// The state from the closest instance of this class that encloses the given context.
diff --git a/lib/src/circular_chart.dart b/lib/src/circular_chart.dart
index c6ae25c..772190b 100644
--- a/lib/src/circular_chart.dart
+++ b/lib/src/circular_chart.dart
@@ -12,7 +12,7 @@ class CircularChart {
   CircularChart(
     this.stacks,
     this.chartType, {
-    this.edgeStyle = SegmentEdgeStyle.Flat,
+    this.edgeStyle = SegmentEdgeStyle.flat,
   });
 
   final List<CircularChartStack> stacks;
diff --git a/lib/src/painter.dart b/lib/src/painter.dart
index 1d81ddb..83efd39 100644
--- a/lib/src/painter.dart
+++ b/lib/src/painter.dart
@@ -57,7 +57,7 @@ void _paintChart(Canvas canvas, Size size, CircularChart chart) {
     ..style = chart.chartType == CircularChartType.Radial
         ? PaintingStyle.stroke
         : PaintingStyle.fill
-    ..strokeCap = chart.edgeStyle == SegmentEdgeStyle.Round
+    ..strokeCap = chart.edgeStyle == SegmentEdgeStyle.round
         ? StrokeCap.round
         : StrokeCap.butt;