diff --git a/test/lib/PackageOverrideFile.js b/test/lib/PackageOverrideFile.js
index c8359d4..8c33828 100644
--- a/test/lib/PackageOverrideFile.js
+++ b/test/lib/PackageOverrideFile.js
@@ -30,7 +30,8 @@ var ALLOWED_PROPERTIES = [
 	'browser',
 	'modules',
 	'systemjs',
-	'defaultExtension'
+	'defaultExtension',
+	'browserifyCore'
 ];
 
 /**