diff --git a/src/qtism/data/AssessmentItem.php b/src/qtism/data/AssessmentItem.php
index ffcd4f8b7..792fc903f 100644
--- a/src/qtism/data/AssessmentItem.php
+++ b/src/qtism/data/AssessmentItem.php
@@ -228,7 +228,7 @@ public function __construct($identifier, $title, $timeDependent, $lang = '')
      */
     public function setIdentifier($identifier): void
     {
-        if (Format::isIdentifier($identifier, false)) {
+        if (Format::isNormalizedString($identifier)) {
             $this->identifier = $identifier;
             $this->notify();
         } else {
diff --git a/test/qtismtest/data/AssessmentItemTest.php b/test/qtismtest/data/AssessmentItemTest.php
index 0a379fd42..3b13b4112 100644
--- a/test/qtismtest/data/AssessmentItemTest.php
+++ b/test/qtismtest/data/AssessmentItemTest.php
@@ -768,9 +768,9 @@ public function getResponseValidityConstraintsProvider(): array
     public function testCreateAssessmentItemWrongIdentifier(): void
     {
         $this->expectException(InvalidArgumentException::class);
-        $this->expectExceptionMessage("The identifier argument must be a valid QTI Identifier, '999' given.");
+        $this->expectExceptionMessage("The identifier argument must be a valid QTI Identifier, '99\t9' given.");
 
-        $assessmentItem = new AssessmentItem('999', 'Nine Nine Nine', false);
+        $assessmentItem = new AssessmentItem("99\t9", 'Nine Nine Nine', false);
     }
 
     public function testCreateAssessmentItemWrongTitle(): void