diff --git a/library/includes/core/mysql.php b/library/includes/core/mysql.php
index 0711187a..935dd463 100644
--- a/library/includes/core/mysql.php
+++ b/library/includes/core/mysql.php
@@ -729,10 +729,7 @@ class sql_db
 			}
 		}
 
-		if (!defined('IN_FIRST_SLOW_QUERY'))
-		{
-			define('IN_FIRST_SLOW_QUERY', true);
-		}
+		@define('IN_FIRST_SLOW_QUERY', true);
 		CACHE('bb_cache')->set('dont_log_slow_query', $new_priority, $ignoring_time);
 	}