diff --git a/FSLineChart/FSLineChart/FSLineChart.m b/FSLineChart/FSLineChart/FSLineChart.m
index b5390d4..3a58a5b 100644
--- a/FSLineChart/FSLineChart/FSLineChart.m
+++ b/FSLineChart/FSLineChart/FSLineChart.m
@@ -313,7 +313,8 @@ - (void)drawGrid
             CGContextStrokePath(ctx);
         }
     }
-    
+    //@step should be pop to release
+    UIGraphicsPopContext();
 }
 
 - (void)clearChartData