diff --git a/htdocs/core/modules/asset/doc/pdf_standard_asset.modules.php b/htdocs/core/modules/asset/doc/pdf_standard_asset.modules.php
index 1e289930cf0..9f3bc424aa3 100644
--- a/htdocs/core/modules/asset/doc/pdf_standard_asset.modules.php
+++ b/htdocs/core/modules/asset/doc/pdf_standard_asset.modules.php
@@ -347,7 +347,7 @@ class pdf_standard_asset extends ModelePDFAsset
 				$pdf->SetCreator("Dolibarr ".DOL_VERSION);
 				$pdf->SetAuthor($outputlangs->convToOutputCharset($user->getFullName($outputlangs)));
 				$pdf->SetKeyWords($outputlangs->convToOutputCharset($object->ref)." ".$outputlangs->transnoentities("PdfTitle")." ".$outputlangs->convToOutputCharset($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/bank/doc/pdf_ban.modules.php b/htdocs/core/modules/bank/doc/pdf_ban.modules.php
index bbbd82ec1c7..ddc65b1ff8c 100644
--- a/htdocs/core/modules/bank/doc/pdf_ban.modules.php
+++ b/htdocs/core/modules/bank/doc/pdf_ban.modules.php
@@ -170,7 +170,7 @@ class pdf_ban extends ModeleBankAccountDoc
 				$pdf->SetCreator("Dolibarr ".DOL_VERSION);
 				$pdf->SetAuthor($outputlangs->convToOutputCharset($user->getFullName($outputlangs)));
 				$pdf->SetKeyWords($outputlangs->convToOutputCharset($object->ref)." ".$outputlangs->transnoentities("BAN"));
-				if (!empty($conf->global->MAIN_DISABLE_PDF_COMPRESSION)) {
+				if (getDolGlobalString('MAIN_DISABLE_PDF_COMPRESSION')) {
 					$pdf->SetCompression(false);
 				}
 
diff --git a/htdocs/core/modules/bank/doc/pdf_sepamandate.modules.php b/htdocs/core/modules/bank/doc/pdf_sepamandate.modules.php
index e09fef45bf0..245f1dafe5c 100644
--- a/htdocs/core/modules/bank/doc/pdf_sepamandate.modules.php
+++ b/htdocs/core/modules/bank/doc/pdf_sepamandate.modules.php
@@ -182,7 +182,7 @@ class pdf_sepamandate extends ModeleBankAccountDoc
 				$pdf->SetCreator("Dolibarr ".DOL_VERSION);
 				$pdf->SetAuthor($outputlangs->convToOutputCharset($user->getFullName($outputlangs)));
 				$pdf->SetKeyWords($outputlangs->convToOutputCharset($object->ref)." ".$outputlangs->transnoentities("SepaMandate"));
-				if (!empty($conf->global->MAIN_DISABLE_PDF_COMPRESSION)) {
+				if (getDolGlobalString('MAIN_DISABLE_PDF_COMPRESSION')) {
 					$pdf->SetCompression(false);
 				}