diff --git a/client/js/index.js b/client/js/index.js
index 2091645..c3a5c53 100644
--- a/client/js/index.js
+++ b/client/js/index.js
@@ -326,6 +326,9 @@ function createSensor(sensor) {
           ...(sensor.config.graphType === 'bar' && { type: 'bar' }),
           x: values.map((v) => new Date(v.timestamp * 1000)),
           y: values.map((v) => v.value),
+          line: {
+            width: 1
+          }
         },
       ],
       {