diff --git a/tests/PhpPresentation/Tests/Writer/PowerPoint2007/PptSlidesTest.php b/tests/PhpPresentation/Tests/Writer/PowerPoint2007/PptSlidesTest.php
index 652ebd5b4..3fed3b8d8 100644
--- a/tests/PhpPresentation/Tests/Writer/PowerPoint2007/PptSlidesTest.php
+++ b/tests/PhpPresentation/Tests/Writer/PowerPoint2007/PptSlidesTest.php
@@ -885,7 +885,7 @@ public function testRichTextRunFontCharset(): void
         $this->assertZipXmlAttributeExists('ppt/slides/slide1.xml', $latinElement, 'typeface');
         $this->assertZipXmlAttributeEquals('ppt/slides/slide1.xml', $latinElement, 'typeface', 'Calibri');
         $this->assertZipXmlAttributeExists('ppt/slides/slide1.xml', $latinElement, 'charset');
-        $this->assertZipXmlAttributeEquals('ppt/slides/slide1.xml', $latinElement, 'charset', '12');
+        $this->assertZipXmlAttributeEquals('ppt/slides/slide1.xml', $latinElement, 'charset', '18');
         $this->assertZipXmlElementNotExists('ppt/slides/slide1.xml', $eastAsianElement);
         $this->assertZipXmlElementNotExists('ppt/slides/slide1.xml', $complexScriptElement);
         $this->assertIsSchemaECMA376Valid();
@@ -898,7 +898,7 @@ public function testRichTextRunFontCharset(): void
         $this->assertZipXmlAttributeExists('ppt/slides/slide1.xml', $eastAsianElement, 'typeface');
         $this->assertZipXmlAttributeEquals('ppt/slides/slide1.xml', $eastAsianElement, 'typeface', 'Calibri');
         $this->assertZipXmlAttributeExists('ppt/slides/slide1.xml', $eastAsianElement, 'charset');
-        $this->assertZipXmlAttributeEquals('ppt/slides/slide1.xml', $eastAsianElement, 'charset', '12');
+        $this->assertZipXmlAttributeEquals('ppt/slides/slide1.xml', $eastAsianElement, 'charset', '18');
         $this->assertZipXmlElementNotExists('ppt/slides/slide1.xml', $complexScriptElement);
         $this->assertIsSchemaECMA376Valid();
 
@@ -911,7 +911,7 @@ public function testRichTextRunFontCharset(): void
         $this->assertZipXmlAttributeExists('ppt/slides/slide1.xml', $complexScriptElement, 'typeface');
         $this->assertZipXmlAttributeEquals('ppt/slides/slide1.xml', $complexScriptElement, 'typeface', 'Calibri');
         $this->assertZipXmlAttributeExists('ppt/slides/slide1.xml', $complexScriptElement, 'charset');
-        $this->assertZipXmlAttributeEquals('ppt/slides/slide1.xml', $complexScriptElement, 'charset', '12');
+        $this->assertZipXmlAttributeEquals('ppt/slides/slide1.xml', $complexScriptElement, 'charset', '18');
         $this->assertIsSchemaECMA376Valid();
     }