diff --git a/src/Controllers/LintController.php b/src/Controllers/LintController.php
index 2c056456bc..bfba70e476 100644
--- a/src/Controllers/LintController.php
+++ b/src/Controllers/LintController.php
@@ -20,7 +20,7 @@ use function json_encode;
  */
 final class LintController implements InvocableController
 {
-    public const EDITOR_SQL_PREFIX = [
+    private const EDITOR_SQL_PREFIX = [
         'event' => "DELIMITER $$ CREATE EVENT `a` ON SCHEDULE EVERY MINUTE DO\n",
         'routine' => "DELIMITER $$ CREATE PROCEDURE `a`()\n",
         'trigger' => "DELIMITER $$ CREATE TRIGGER `a` AFTER INSERT ON `b` FOR EACH ROW\n",
diff --git a/src/Display/Results.php b/src/Display/Results.php
index 52d1ef3870..e2c606c993 100644
--- a/src/Display/Results.php
+++ b/src/Display/Results.php
@@ -86,10 +86,10 @@ use function trim;
  */
 class Results
 {
-    public const POSITION_LEFT = 'left';
-    public const POSITION_RIGHT = 'right';
-    public const POSITION_BOTH = 'both';
-    public const POSITION_NONE = 'none';
+    private const POSITION_LEFT = 'left';
+    private const POSITION_RIGHT = 'right';
+    private const POSITION_BOTH = 'both';
+    private const POSITION_NONE = 'none';
 
     public const DISPLAY_FULL_TEXT = 'F';
     public const DISPLAY_PARTIAL_TEXT = 'P';
@@ -101,15 +101,14 @@ class Results
     public const GEOMETRY_DISP_WKT = 'WKT';
     public const GEOMETRY_DISP_WKB = 'WKB';
 
-    public const SMART_SORT_ORDER = 'SMART';
-    public const ASCENDING_SORT_DIR = 'ASC';
-    public const DESCENDING_SORT_DIR = 'DESC';
+    private const SMART_SORT_ORDER = 'SMART';
+    private const ASCENDING_SORT_DIR = 'ASC';
+    private const DESCENDING_SORT_DIR = 'DESC';
 
-    public const TABLE_TYPE_INNO_DB = 'InnoDB';
     public const ALL_ROWS = 'all';
 
-    public const ACTION_LINK_CONTENT_ICONS = 'icons';
-    public const ACTION_LINK_CONTENT_TEXT = 'text';
+    private const ACTION_LINK_CONTENT_ICONS = 'icons';
+    private const ACTION_LINK_CONTENT_TEXT = 'text';
 
     /**
      * the total number of rows returned by the SQL query without any appended "LIMIT" clause programmatically