diff --git a/packages/datadog-instrumentations/src/express.js b/packages/datadog-instrumentations/src/express.js
index 1d8645e9af..b093eab783 100644
--- a/packages/datadog-instrumentations/src/express.js
+++ b/packages/datadog-instrumentations/src/express.js
@@ -102,7 +102,7 @@ addHook({
 })
 
 const processParamsStartCh = channel('datadog:express:process_params:start')
-const wrapProcessParamsMethod = (requestPositionInArguments) => {
+function wrapProcessParamsMethod (requestPositionInArguments) {
   return function wrapProcessParams (original) {
     return function wrappedProcessParams () {
       if (processParamsStartCh.hasSubscribers) {