diff --git a/htdocs/core/lib/pdf.lib.php b/htdocs/core/lib/pdf.lib.php
index 1641aeb132c..cdf05a2c29d 100644
--- a/htdocs/core/lib/pdf.lib.php
+++ b/htdocs/core/lib/pdf.lib.php
@@ -838,7 +838,7 @@ function pdf_pagefoot(&$pdf,$outputlangs,$paramfreetext,$fromcompany,$marge_bass
 	}
 
 	// Show page nb only on iso languages (so default Helvetica font)
-	if (mb_strtolower(pdf_getPDFFont($outputlangs)) == 'helvetica')
+	if (strtolower(pdf_getPDFFont($outputlangs)) == 'helvetica')
 	{
 		$pdf->SetXY(-20,-$posy);
 		//print 'xxx'.$pdf->PageNo().'-'.$pdf->getAliasNbPages().'-'.$pdf->getAliasNumPage();exit;