diff --git a/lib/report_plugins/calibrations.js b/lib/report_plugins/calibrations.js
index 958dd06c906..1d31480b732 100644
--- a/lib/report_plugins/calibrations.js
+++ b/lib/report_plugins/calibrations.js
@@ -146,10 +146,10 @@ calibrations.report = function report_calibrations (datastorage, sorteddaystosho
     calibration_context = charts.append('g');
 
     // define the parts of the axis that aren't dependent on width or height
-    xScale2 = d3.scale.linear()
+    xScale2 = d3.scaleLinear()
       .domain([0, maxBG]);
 
-    yScale2 = d3.scale.linear()
+    yScale2 = d3.scaleLinear()
       .domain([0, 400000]);
 
     var xAxis2 = d3.svg.axis()