diff --git a/plugins/API/ProcessedReport.php b/plugins/API/ProcessedReport.php
index 9c6893057dba31e7a5bb74547fb4e25791efb497..772ff911f45bddf15c6a07c9a939513cb5681014 100644
--- a/plugins/API/ProcessedReport.php
+++ b/plugins/API/ProcessedReport.php
@@ -339,6 +339,17 @@ class ProcessedReport
         return $actualReports; // make sure array has contiguous key values
     }
 
+    private static $translatedOrderOfReports = null;
+
+    /**
+     * Resets translated reports.
+     * FOR TESTING ONLY
+     */
+    public static function reset()
+    {
+        self::$translatedOrderOfReports = null;
+    }
+
     /**
      * API metadata are sorted by category/name,
      * with a little tweak to replicate the standard Piwik category ordering
@@ -349,16 +360,15 @@ class ProcessedReport
      */
     private static function sortReports($a, $b)
     {
-        static $order = null;
-        if (is_null($order)) {
-            $order = array();
+        if (is_null(self::$translatedOrderOfReports)) {
+            self::$translatedOrderOfReports = array();
             foreach (Report::$orderOfReports as $category) {
-                $order[] = Piwik::translate($category);
+                self::$translatedOrderOfReports[] = Piwik::translate($category);
             }
         }
 
-        $posA = array_search($a['category'], $order);
-        $posB = array_search($b['category'], $order);
+        $posA = array_search($a['category'], self::$translatedOrderOfReports);
+        $posB = array_search($b['category'], self::$translatedOrderOfReports);
 
         if ($posA === false && $posB === false) {
             return strcmp($a['category'], $b['category']);
diff --git a/tests/PHPUnit/Framework/Fixture.php b/tests/PHPUnit/Framework/Fixture.php
index fdd4ceb1e06b2776e75dd50de96cef39e083ab58..2da59d83e0c9ff929ab3beb57d3014f81df78d13 100644
--- a/tests/PHPUnit/Framework/Fixture.php
+++ b/tests/PHPUnit/Framework/Fixture.php
@@ -28,6 +28,7 @@ use Piwik\Option;
 use Piwik\Piwik;
 use Piwik\Plugin;
 use Piwik\Plugin\Manager;
+use Piwik\Plugins\API\ProcessedReport;
 use Piwik\Plugins\LanguagesManager\API as APILanguageManager;
 use Piwik\Plugins\MobileMessaging\MobileMessaging;
 use Piwik\Plugins\PrivacyManager\DoNotTrackHeaderChecker;
@@ -255,6 +256,8 @@ class Fixture extends \PHPUnit_Framework_Assert
 
         Cache::deleteTrackerCache();
 
+        ProcessedReport::reset();
+
         self::resetPluginsInstalledConfig();
 
         $testEnvironment = $this->getTestEnvironment();
diff --git a/tests/PHPUnit/Framework/TestCase/SystemTestCase.php b/tests/PHPUnit/Framework/TestCase/SystemTestCase.php
index 0dd79873ab453afa8b87b7622da39a384c8fa6f1..470582cbbdc28b8fc8c1d15677b9188ca3cc57bb 100755
--- a/tests/PHPUnit/Framework/TestCase/SystemTestCase.php
+++ b/tests/PHPUnit/Framework/TestCase/SystemTestCase.php
@@ -22,7 +22,6 @@ use Piwik\Tests\Framework\Constraint\HttpResponseText;
 use Piwik\Tests\Framework\TestRequest\ApiTestConfig;
 use Piwik\Tests\Framework\TestRequest\Collection;
 use Piwik\Tests\Framework\TestRequest\Response;
-use Piwik\Translate;
 use Piwik\Log;
 use PHPUnit_Framework_TestCase;
 use Piwik\Tests\Framework\Fixture;