diff --git a/modules/simpletest/drupal_web_test_case.php b/modules/simpletest/drupal_web_test_case.php
index 42c128c..94a9fa5 100644
--- a/modules/simpletest/drupal_web_test_case.php
+++ b/modules/simpletest/drupal_web_test_case.php
@@ -1721,9 +1721,10 @@ class DrupalWebTestCase extends DrupalTestCase {
         $this->storeCache($modules_cache_key_suffix);
       }
     }
-
-    // Reset/rebuild all data structures after enabling the modules.
-    $this->resetAll();
+    else {
+      // Reset/rebuild all data structures after enabling the modules.
+      $this->resetAll();
+    }
 
     // Ensure that the session is not written to the new environment and replace
     // the global $user session with uid 1 from the new test site.