diff --git a/tests/PHPUnit/Fixture.php b/tests/PHPUnit/Fixture.php
index 129ea81f0c03039b91570b8ddcac9e1ee04fb332..24cc9782ef034a83959579074e7d93a147b6ca04 100644
--- a/tests/PHPUnit/Fixture.php
+++ b/tests/PHPUnit/Fixture.php
@@ -84,6 +84,7 @@ class Fixture extends PHPUnit_Framework_Assert
     public function performSetUp($testCase, $setupEnvironmentOnly = false)
     {
         $this->testEnvironment = new Piwik_TestingEnvironment();
+        $this->testEnvironment->delete();
 
         try {
             \Piwik\SettingsPiwik::$piwikUrlCache = '';
diff --git a/tests/PHPUnit/TestingEnvironment.php b/tests/PHPUnit/TestingEnvironment.php
index 65b1095880d059f6967dbfa929956713bbdb34ad..d13f918516aa853c2ce68f047d77afe7913dc997 100644
--- a/tests/PHPUnit/TestingEnvironment.php
+++ b/tests/PHPUnit/TestingEnvironment.php
@@ -68,6 +68,12 @@ class Piwik_TestingEnvironment
         file_put_contents($overridePath, json_encode($this->behaviorOverrideProperties));
     }
 
+    public function delete()
+    {
+        $this->behaviorOverrideProperties = array();
+        $this->save();
+    }
+
     public static function addHooks()
     {
         $testingEnvironment = new Piwik_TestingEnvironment();