diff --git a/src/util/customTransformer-v1.js b/src/util/customTransformer-v1.js
index b6ed8f9654..ddc1cacd17 100644
--- a/src/util/customTransformer-v1.js
+++ b/src/util/customTransformer-v1.js
@@ -6,6 +6,7 @@ const logger = require('../logger');
 const stats = require('./stats');
 
 const userTransformTimeout = parseInt(process.env.USER_TRANSFORM_TIMEOUT || '600000', 10);
+const ivmExecutionTimeout = parseInt(process.env.IVM_EXECUTION_TIMEOUT || '4000', 10);
 
 async function transform(isolatevm, events) {
   const transformationPayload = {};
@@ -24,7 +25,7 @@ async function transform(isolatevm, events) {
           new ivm.Reference(reject),
           sharedTransformationPayload,
         ],
-        { timeout: 4000 },
+        { timeout: ivmExecutionTimeout },
       );
     } catch (error) {
       reject(error.message);