diff --git a/webpack.config-test.js b/webpack.config-test.js
index 6c1dfa64..4896c665 100644
--- a/webpack.config-test.js
+++ b/webpack.config-test.js
@@ -4,6 +4,7 @@ const path = require("path");
 const config = require("./webpack.config.js");
 
 config.target = "node";
+config.devtool = "eval";
 
 // Instrumentation for coverage with Istanbul
 config.module.rules.push({