diff --git a/.eslintrc.json b/.eslintrc.json
index 2064f1c..233de72 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -30,6 +30,7 @@
     "no-underscore-dangle":0,
     "no-unused-vars":0, // for now...
     "no-console": 0,
+    "consistent-return": 0,
     "jsx-a11y/label-has-associated-control": [
       "error",
       {
diff --git a/source/hooks/useFetch.js b/source/hooks/useFetch.js
index 14d3c1c..5e0c25d 100644
--- a/source/hooks/useFetch.js
+++ b/source/hooks/useFetch.js
@@ -4,7 +4,7 @@ import * as d3 from 'd3';
 function isNumeric(str) {
   if (typeof str !== 'string') return false; // we only process strings!
   return (
-    !isNaN(str)
+    !Number.isNaN(str)
     // use type coercion to parse the _entirety_ of the string
     // (`parseFloat` alone does not do this)...
     && !Number.isNaN(parseFloat(str))