diff --git a/htdocs/core/lib/pdf.lib.php b/htdocs/core/lib/pdf.lib.php
index 282bdec690e..d1a5e64dce2 100644
--- a/htdocs/core/lib/pdf.lib.php
+++ b/htdocs/core/lib/pdf.lib.php
@@ -1808,8 +1808,17 @@ function pdf_getlineprogress($object, $i, $outputlangs, $hidedetails = 0, $hookm
 	}
 	if (empty($reshook))
 	{
-        if ($object->lines[$i]->special_code == 3) return '';
-	    if (empty($hidedetails) || $hidedetails > 1) $result.=$object->lines[$i]->situation_percent . '%';
+        	if ($object->lines[$i]->special_code == 3) return '';
+		if (empty($hidedetails) || $hidedetails > 1)
+		{
+			if($conf->global->SITUATION_DISPLAY_DIFF_ON_PDF)
+			{
+			 	$prev_progress = $object->lines[$i]->get_prev_progress($object->id);
+			 	$result = ($prev_progress - $object->lines[$i]->situation_percent) . '%';
+			}
+			else
+				$result = $object->lines[$i]->situation_percent . '%';
+	  	}
 	}
 	return $result;
 }