diff --git a/src/parallel/parallel.tsx b/src/parallel/parallel.tsx
index 754c8471..b2fd8eed 100644
--- a/src/parallel/parallel.tsx
+++ b/src/parallel/parallel.tsx
@@ -267,8 +267,8 @@ export class ParallelPlot extends React.Component<ParallelPlotData, ParallelPlot
       this.yscale[k] = this.createScale(k);
       return true;
     }.bind(this)).reverse().sort(function(this: ParallelPlot, a: string, b: string) {
-      const pda = this.state.order.findIndex((e) => e == a);
-      const pdb = this.state.order.findIndex((e) => e == b);
+      const pda = this.state.order.findIndex((e) => e == b);
+      const pdb = this.state.order.findIndex((e) => e == a);
       return (pdb == -1 ? this.state.order.length : pdb) - (pda == -1 ? this.state.order.length : pda);
     }.bind(this));
     this.setState({