diff --git a/lib/public/javascripts/chart.js b/lib/public/javascripts/chart.js
index c0212ffa..adea87e8 100644
--- a/lib/public/javascripts/chart.js
+++ b/lib/public/javascripts/chart.js
@@ -77,6 +77,7 @@ function getLayout(title, textcolour, boxcolour) {
       }
     },
     yaxis: {
+      rangemode: 'tozero',
       gridcolor: '#D3D3D3',
       tickangle: 315,
       tickfont: {