diff --git a/lib/validate.js b/lib/validate.js
index <HASH>..<HASH> 100644
--- a/lib/validate.js
+++ b/lib/validate.js
@@ -108,7 +108,7 @@ module.exports = {
           _.merge(entries, entry);
         }
 
-        if (runtime === 'provided' && loadedFunc.webpackAllowCustomRuntime) {
+        if (runtime === 'provided' && loadedFunc.allowCustomRuntime) {
           // allow custom runtime if the user has specified it
           const entry = getEntryForFunction.call(this, functions[index], loadedFunc);
           _.merge(entries, entry);
diff --git a/tests/validate.test.js b/tests/validate.test.js
index <HASH>..<HASH> 100644
--- a/tests/validate.test.js
+++ b/tests/validate.test.js
@@ -576,7 +576,7 @@ describe('validate', () => {
               }
             ],
             runtime: 'provided',
-            webpackAllowCustomRuntime: true
+            allowCustomRuntime: true
           },
           func3: {
             handler: 'module3.func2handler',
remane webpackAllowCustomRuntime to allowCustomRuntime