diff --git a/WatchChart Extension/NKWatchChart/NKLineChart.h b/WatchChart Extension/NKWatchChart/NKLineChart.h
index 8489677..547f37c 100644
--- a/WatchChart Extension/NKWatchChart/NKLineChart.h	
+++ b/WatchChart Extension/NKWatchChart/NKLineChart.h	
@@ -11,6 +11,8 @@
 
 @interface NKLineChart : NSObject
 
+@property (nonatomic) CGRect frame;
+
 // Background color of the chart
 @property (nonatomic) UIColor *chartBackgroundColor;
 // Array of `LineChartData` objects, one for each line.
diff --git a/WatchChart Extension/NKWatchChart/NKLineChart.m b/WatchChart Extension/NKWatchChart/NKLineChart.m
index 8fd8c96..eda624e 100644
--- a/WatchChart Extension/NKWatchChart/NKLineChart.m	
+++ b/WatchChart Extension/NKWatchChart/NKLineChart.m	
@@ -14,7 +14,6 @@
 
 @interface NKLineChart ()
 
-@property (nonatomic) CGRect frame;
 @property (nonatomic) NSMutableArray *chartLineArray;
 
 // Array of line path, one for each line.
@@ -71,6 +70,13 @@ - (void)setupDefaultValues
     _axisWidth = 1.f;
 }
 
+- (void)setFrame:(CGRect)frame
+{
+    _frame = frame;
+    _chartCavanWidth = frame.size.width - _chartMargin * 2;
+    _chartCavanHeight = frame.size.height - _chartMargin * 2;
+}
+
 #pragma mark - Draw Chart
 
 - (UIImage *)drawImage