diff --git a/htdocs/core/modules/cheque/doc/pdf_blochet.class.php b/htdocs/core/modules/cheque/doc/pdf_blochet.class.php
index f32b2306624..fa3f6e7a6b8 100644
--- a/htdocs/core/modules/cheque/doc/pdf_blochet.class.php
+++ b/htdocs/core/modules/cheque/doc/pdf_blochet.class.php
@@ -155,7 +155,7 @@ class BordereauChequeBlochet extends ModeleChequeReceipts
 		$pdf->SetCreator("Dolibarr ".DOL_VERSION);
 		$pdf->SetAuthor($outputlangs->convToOutputCharset($user->getFullName($outputlangs)));
 		$pdf->SetKeyWords($outputlangs->transnoentities("CheckReceipt")." ".$number);
-		if (!empty($conf->global->MAIN_DISABLE_PDF_COMPRESSION)) {
+		if (getDolGlobalString('MAIN_DISABLE_PDF_COMPRESSION')) {
 			$pdf->SetCompression(false);
 		}
 
diff --git a/htdocs/core/modules/commande/doc/pdf_einstein.modules.php b/htdocs/core/modules/commande/doc/pdf_einstein.modules.php
index ca8d5bd2a74..ff698a7566f 100644
--- a/htdocs/core/modules/commande/doc/pdf_einstein.modules.php
+++ b/htdocs/core/modules/commande/doc/pdf_einstein.modules.php
@@ -323,7 +323,7 @@ class pdf_einstein extends ModelePDFCommandes
 				$pdf->SetCreator("Dolibarr ".DOL_VERSION);
 				$pdf->SetAuthor($outputlangs->convToOutputCharset($user->getFullName($outputlangs)));
 				$pdf->SetKeyWords($outputlangs->convToOutputCharset($object->ref)." ".$outputlangs->transnoentities("PdfOrderTitle")." ".$outputlangs->convToOutputCharset($object->thirdparty->name));
-				if (!empty($conf->global->MAIN_DISABLE_PDF_COMPRESSION)) {
+				if (getDolGlobalString('MAIN_DISABLE_PDF_COMPRESSION')) {
 					$pdf->SetCompression(false);
 				}
 
diff --git a/htdocs/core/modules/commande/doc/pdf_eratosthene.modules.php b/htdocs/core/modules/commande/doc/pdf_eratosthene.modules.php
index 77854c9d091..50a4736fe24 100644
--- a/htdocs/core/modules/commande/doc/pdf_eratosthene.modules.php
+++ b/htdocs/core/modules/commande/doc/pdf_eratosthene.modules.php
@@ -365,7 +365,7 @@ class pdf_eratosthene extends ModelePDFCommandes
 				$pdf->SetCreator("Dolibarr ".DOL_VERSION);
 				$pdf->SetAuthor($outputlangs->convToOutputCharset($user->getFullName($outputlangs)));
 				$pdf->SetKeyWords($outputlangs->convToOutputCharset($object->ref)." ".$outputlangs->transnoentities("PdfOrderTitle")." ".$outputlangs->convToOutputCharset($object->thirdparty->name));
-				if (!empty($conf->global->MAIN_DISABLE_PDF_COMPRESSION)) {
+				if (getDolGlobalString('MAIN_DISABLE_PDF_COMPRESSION')) {
 					$pdf->SetCompression(false);
 				}