diff --git a/htdocs/core/modules/rapport/pdf_paiement.class.php b/htdocs/core/modules/rapport/pdf_paiement.class.php
index 8cb10e0a0f8..5440c8e1201 100644
--- a/htdocs/core/modules/rapport/pdf_paiement.class.php
+++ b/htdocs/core/modules/rapport/pdf_paiement.class.php
@@ -303,7 +303,7 @@ class pdf_paiement
 		$pdf->SetCreator("Dolibarr ".DOL_VERSION);
 		$pdf->SetAuthor($outputlangs->convToOutputCharset($user->getFullName($outputlangs)));
 		//$pdf->SetKeyWords();
-		if (!empty($conf->global->MAIN_DISABLE_PDF_COMPRESSION)) {
+		if (getDolGlobalString('MAIN_DISABLE_PDF_COMPRESSION')) {
 			$pdf->SetCompression(false);
 		}
 
diff --git a/htdocs/core/modules/reception/doc/pdf_squille.modules.php b/htdocs/core/modules/reception/doc/pdf_squille.modules.php
index fb0e59fcb3a..65a12b1061d 100644
--- a/htdocs/core/modules/reception/doc/pdf_squille.modules.php
+++ b/htdocs/core/modules/reception/doc/pdf_squille.modules.php
@@ -251,7 +251,7 @@ class pdf_squille extends ModelePdfReception
 				$pdf->SetCreator("Dolibarr ".DOL_VERSION);
 				$pdf->SetAuthor($outputlangs->convToOutputCharset($user->getFullName($outputlangs)));
 				$pdf->SetKeyWords($outputlangs->convToOutputCharset($object->ref)." ".$outputlangs->transnoentities("Reception"));
-				if (!empty($conf->global->MAIN_DISABLE_PDF_COMPRESSION)) {
+				if (getDolGlobalString('MAIN_DISABLE_PDF_COMPRESSION')) {
 					$pdf->SetCompression(false);
 				}
 
diff --git a/htdocs/core/modules/stock/doc/pdf_standard.modules.php b/htdocs/core/modules/stock/doc/pdf_standard.modules.php
index c61fb5a5ff3..71030535a23 100644
--- a/htdocs/core/modules/stock/doc/pdf_standard.modules.php
+++ b/htdocs/core/modules/stock/doc/pdf_standard.modules.php
@@ -251,7 +251,7 @@ class pdf_standard extends ModelePDFStock
 				$pdf->SetCreator("Dolibarr ".DOL_VERSION);
 				$pdf->SetAuthor($outputlangs->convToOutputCharset($user->getFullName($outputlangs)));
 				$pdf->SetKeyWords($outputlangs->convToOutputCharset($object->ref)." ".$outputlangs->transnoentities("Stock")." ".$outputlangs->convToOutputCharset($object->label));
-				if (!empty($conf->global->MAIN_DISABLE_PDF_COMPRESSION)) {
+				if (getDolGlobalString('MAIN_DISABLE_PDF_COMPRESSION')) {
 					$pdf->SetCompression(false);
 				}