diff --git a/src/Presentation/Component/Property/Value/TextValue.php b/src/Presentation/Component/Property/Value/TextValue.php
index 99d2b9ca..5f3ac1e8 100644
--- a/src/Presentation/Component/Property/Value/TextValue.php
+++ b/src/Presentation/Component/Property/Value/TextValue.php
@@ -21,7 +21,7 @@ class TextValue extends Value
     /**
      * ESCAPED-CHAR as defined in section 3.3.11.
      */
-    private const ESCAPED_CHARACTERS = [
+    private const array ESCAPED_CHARACTERS = [
         '\\' => '\\\\',
         ';' => '\\;',
         ',' => '\\,',
@@ -32,7 +32,7 @@ class TextValue extends Value
     /**
      * Non TSAFE-CHAR as described in section 3.3.11.
      */
-    private const FORBIDDEN_CHARACTERS = [
+    private const array FORBIDDEN_CHARACTERS = [
         "\x00",
         "\x01",
         "\x02",