diff --git a/lib/src/chart/bar_chart/bar_chart.dart b/lib/src/chart/bar_chart/bar_chart.dart
index 1acd0ea3d..5861169cd 100644
--- a/lib/src/chart/bar_chart/bar_chart.dart
+++ b/lib/src/chart/bar_chart/bar_chart.dart
@@ -132,7 +132,7 @@ class BarChartState extends AnimatedWidgetBaseState<BarChart> {
   Size _getChartSize() {
     if (_chartKey.currentContext != null) {
       final RenderBox containerRenderBox = _chartKey.currentContext.findRenderObject();
-      return containerRenderBox.size;
+      return containerRenderBox.constraints.biggest;
     } else {
       return getDefaultSize(context);
     }
diff --git a/lib/src/chart/line_chart/line_chart.dart b/lib/src/chart/line_chart/line_chart.dart
index 5c2a3593c..0b767699b 100644
--- a/lib/src/chart/line_chart/line_chart.dart
+++ b/lib/src/chart/line_chart/line_chart.dart
@@ -132,7 +132,7 @@ class LineChartState extends AnimatedWidgetBaseState<LineChart> {
   Size _getChartSize() {
     if (_chartKey.currentContext != null) {
       final RenderBox containerRenderBox = _chartKey.currentContext.findRenderObject();
-      return containerRenderBox.size;
+      return containerRenderBox.constraints.biggest;
     } else {
       return getDefaultSize(context);
     }
diff --git a/lib/src/chart/pie_chart/pie_chart.dart b/lib/src/chart/pie_chart/pie_chart.dart
index 50db48b89..436d474f6 100644
--- a/lib/src/chart/pie_chart/pie_chart.dart
+++ b/lib/src/chart/pie_chart/pie_chart.dart
@@ -108,7 +108,7 @@ class PieChartState extends AnimatedWidgetBaseState<PieChart> {
   Size _getChartSize() {
     if (_chartKey.currentContext != null) {
       final RenderBox containerRenderBox = _chartKey.currentContext.findRenderObject();
-      return containerRenderBox.size;
+      return containerRenderBox.constraints.biggest;
     } else {
       return getDefaultSize(context);
     }