diff --git a/src/diagrams/flowchart/flowRenderer.js b/src/diagrams/flowchart/flowRenderer.js
index 660e6fe23..0fb9db297 100644
--- a/src/diagrams/flowchart/flowRenderer.js
+++ b/src/diagrams/flowchart/flowRenderer.js
@@ -1,5 +1,5 @@
 import graphlib from 'graphlib';
-import { select, curveLinear, curveNatural, selectAll } from 'd3';
+import { select, curveLinear, selectAll } from 'd3';
 
 import flowDb from './flowDb';
 import flow from './parser/flow';