diff --git a/lib/jblond/Diff.php b/lib/jblond/Diff.php
index c7b0368..f166ace 100644
--- a/lib/jblond/Diff.php
+++ b/lib/jblond/Diff.php
@@ -5,6 +5,7 @@
 namespace jblond;
 
 use InvalidArgumentException;
+use jblond\Diff\ConstantsInterface;
 use jblond\Diff\SequenceMatcher;
 use jblond\Diff\Similarity;
 use OutOfRangeException;
@@ -26,20 +27,8 @@
  * @version         2.3.0
  * @link            https://github.com/JBlond/php-diff
  */
-class Diff
+class Diff implements ConstantsInterface
 {
-    /**
-     * Flag to disable ignore of successive empty/blank lines.
-     */
-    public const DIFF_IGNORE_LINE_NONE = 0;
-    /**
-     * Flag to ignore successive empty lines.
-     */
-    public const DIFF_IGNORE_LINE_EMPTY = 1;
-    /**
-     * Flag to ignore successive blank lines. (Lines which contain no or only non printable characters.)
-     */
-    public const DIFF_IGNORE_LINE_BLANK = 2;
     /**
      * @var array   The first version to compare.
      *              Each element contains a line of this string.
diff --git a/lib/jblond/Diff/ConstantsInterface.php b/lib/jblond/Diff/ConstantsInterface.php
new file mode 100644
index 0000000..121e7cb
--- /dev/null
+++ b/lib/jblond/Diff/ConstantsInterface.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace jblond\Diff;
+/**
+ * Constant Interface
+ *
+ * Defines the library constants which needs to be shared across the different classes.
+ *
+ * PHP version 7.2 or greater
+ *
+ * @package         jblond
+ * @author          Ferry Cools <info@DigiLive.nl>
+ * @copyright   (c) 2020 Mario Brandt
+ * @license         New BSD License http://www.opensource.org/licenses/bsd-license.php
+ * @version         2.3.0
+ * @link            https://github.com/JBlond/php-diff
+ */
+interface ConstantsInterface
+{
+    /**
+     * Flag to disable ignore of successive empty/blank lines.
+     */
+    public const DIFF_IGNORE_LINE_NONE = 0;
+    /**
+     * Flag to ignore empty lines.
+     */
+    public const DIFF_IGNORE_LINE_EMPTY = 1;
+    /**
+     * Flag to ignore blank lines. (Lines which contain no or only non printable characters.)
+     */
+    public const DIFF_IGNORE_LINE_BLANK = 2;
+
+}
diff --git a/lib/jblond/Diff/SequenceMatcher.php b/lib/jblond/Diff/SequenceMatcher.php
index 595f1b4..19ea8fa 100644
--- a/lib/jblond/Diff/SequenceMatcher.php
+++ b/lib/jblond/Diff/SequenceMatcher.php
@@ -20,20 +20,8 @@
  * @version         2.3.0
  * @link            https://github.com/JBlond/php-diff
  */
-class SequenceMatcher
+class SequenceMatcher implements ConstantsInterface
 {
-    /**
-     * Flag to disable ignore of successive empty/blank lines.
-     */
-    public const DIFF_IGNORE_LINE_NONE = 0;
-    /**
-     * Flag to ignore empty lines.
-     */
-    public const DIFF_IGNORE_LINE_EMPTY = 1;
-    /**
-     * Flag to ignore blank lines. (Lines which contain no or only non printable characters.)
-     */
-    public const DIFF_IGNORE_LINE_BLANK = 2;
     /**
      * @var array The first sequence to compare against.
      */
@@ -360,12 +348,18 @@ public function getOpCodes(): array
                 $part2 = array_slice($this->new, $j, $bj - $j);
 
                 if ($this->options['ignoreLines'] == 2) {
-                    array_walk($part1, function (&$line) {
-                        $line = trim($line);
-                    });
-                    array_walk($part2, function (&$line) {
-                        $line = trim($line);
-                    });
+                    array_walk(
+                        $part1,
+                        function (&$line) {
+                            $line = trim($line);
+                        }
+                    );
+                    array_walk(
+                        $part2,
+                        function (&$line) {
+                            $line = trim($line);
+                        }
+                    );
                     unset($line);
                 }