diff --git a/builder/index.html b/builder/index.html
index 26cb02c..6eb48a0 100755
--- a/builder/index.html
+++ b/builder/index.html
@@ -419,7 +419,7 @@
         bindColor({target: chart.seriesSet[0].options, name: 'Series fill color', propertyName: 'fillStyle', optional: true, enabled: false, opacity: 0.3});
         bindRange({target: chart.seriesSet[0].options, name: 'Series line width', propertyName: 'lineWidth', min: 0.5, max: 5, scale: 10});
         bindDropDown({
-          target: chart.options,
+          target: chart.seriesSet[0].options,
           name: 'Interpolation',
           propertyName: 'interpolation',
           values: ['bezier', 'linear', 'step']
diff --git a/smoothie.d.ts b/smoothie.d.ts
index 2fb52f2..cd452bd 100644
--- a/smoothie.d.ts
+++ b/smoothie.d.ts
@@ -12,6 +12,11 @@ export interface ITimeSeriesPresentationOptions {
     strokeStyle?: string;
     fillStyle?: string;
     lineWidth?: number;
+    /**
+     * Controls how lines are drawn between data points.
+     * Default value is controlled by <code>SmoothieChart</code>'s <code>interpolation</code> option.
+     */
+    interpolation?: "linear" | "step" | "bezier";
     tooltipLabel?: string;
 }
 
@@ -144,8 +149,8 @@ export interface IChartOptions {
     /** Callback function that formats the intermediate y value labels */
     yIntermediateFormatter?: (intermediate: number, precision: number) => string;
     maxDataSetLength?: number;
-    /** Controls how lines are drawn between data points. Defaults to "bezier". */
-    interpolation?: "linear" | "step" | "bezier";
+    /** Default value for time series presentation options' <code>interpolation</code>. Defaults to "bezier". */
+    interpolation?: ITimeSeriesPresentationOptions['interpolation'];
     /** Optional function to format time stamps for bottom of chart. You may use <code>SmoothieChart.timeFormatter</code>, or your own/ */
     timestampFormatter?: (date: Date) => string;
     horizontalLines?: IHorizontalLine[];
diff --git a/smoothie.js b/smoothie.js
index 5b16254..5fc3f3c 100644
--- a/smoothie.js
+++ b/smoothie.js
@@ -94,6 +94,7 @@
  *        Fix bug rendering issue in series fill when using scroll backwards, by @olssonfredrik
  *        Add title option, by @mesca
  *        Fix data drop stoppage by rejecting NaNs in append(), by @timdrysdale
+ *        Allow setting interpolation per time series, by @WofWca (#123)
  */
 
 ;(function(exports) {
@@ -465,6 +466,7 @@
    *   lineWidth: 1,
    *   strokeStyle: '#ffffff',
    *   fillStyle: undefined,
+   *   interpolation: undefined;
    *   tooltipLabel: undefined
    * }
    * </pre>
@@ -936,7 +938,7 @@
           firstY = y;
           context.moveTo(x, y);
         } else {
-          switch (chartOptions.interpolation) {
+          switch (seriesOptions.interpolation || chartOptions.interpolation) {
             case "linear":
             case "line": {
               context.lineTo(x,y);