diff --git a/htdocs/core/modules/commande/doc/pdf_einstein.modules.php b/htdocs/core/modules/commande/doc/pdf_einstein.modules.php
index b078993e718..45a895e3287 100644
--- a/htdocs/core/modules/commande/doc/pdf_einstein.modules.php
+++ b/htdocs/core/modules/commande/doc/pdf_einstein.modules.php
@@ -261,9 +261,16 @@ class pdf_einstein extends ModelePDFCommandes
 				$dir = $conf->commande->multidir_output[$conf->entity];
 				$file = $dir."/SPECIMEN.pdf";
 			} else {
+				// Possibility to use suffix for proforma
+				$suffix = '';
+				if (!empty($conf->global->PROFORMA_PDF_WITH_SUFFIX)) {
+					$suffix = (GETPOST('model', 2)=='proforma') ? $conf->global->PROFORMA_PDF_WITH_SUFFIX : '';
+					$suffix = dol_sanitizeFileName($suffix);
+				}
+
 				$objectref = dol_sanitizeFileName($object->ref);
 				$dir = $conf->commande->multidir_output[$object->entity]."/".$objectref;
-				$file = $dir."/".$objectref.".pdf";
+				$file = $dir."/".$objectref.$suffix.".pdf";
 			}
 
 			if (!file_exists($dir)) {