diff --git a/modules/dblog/dblog.admin.inc b/modules/dblog/dblog.admin.inc
index 26b0b50c1e91d2438b3ba70841277832c186d0ce..53ae7a0abd9cc47bbedf1ca3a8522229746c4c24 100644
--- a/modules/dblog/dblog.admin.inc
+++ b/modules/dblog/dblog.admin.inc
@@ -376,6 +376,7 @@ function dblog_clear_log_form($form) {
  * Submit callback: clear database with log messages.
  */
 function dblog_clear_log_submit() {
+  $_SESSION['dblog_overview_filter'] = array();
   db_delete('watchdog')->execute();
   drupal_set_message(t('Database log cleared.'));
 }
diff --git a/modules/dblog/dblog.test b/modules/dblog/dblog.test
index ab4de77397be8aefb01746f7dde834ed7dd2846e..19cf0f448735b50fc67a2acec10dd1caed74be64 100644
--- a/modules/dblog/dblog.test
+++ b/modules/dblog/dblog.test
@@ -467,6 +467,10 @@ class DBLogTestCase extends DrupalWebTestCase {
       $count = $this->getTypeCount($types);
       $this->assertEqual(array_sum($count), $type['count'], 'Count matched');
     }
+    
+    // Clear all logs and make sure the confirmation message is found.
+    $this->drupalPost('admin/reports/dblog', array(), t('Clear log messages'));
+    $this->assertText(t('Database log cleared.'), t('Confirmation message found'));
   }
 
   /**