diff --git a/htdocs/core/ajax/onlineSign.php b/htdocs/core/ajax/onlineSign.php
index 08a9ad5c05e..1e3480fa803 100644
--- a/htdocs/core/ajax/onlineSign.php
+++ b/htdocs/core/ajax/onlineSign.php
@@ -181,8 +181,12 @@ if ($action == "importSignature") {
 									$s = $pdf->getTemplatesize($tppl);
 									$pdf->AddPage($s['h'] > $s['w'] ? 'P' : 'L');
 									$pdf->useTemplate($tppl);
+									$propalsignonspecificpage = getDolGlobalInt("PROPAL_SIGNATURE_ON_SPECIFIC_PAGE");
+									if ($propalsignonspecificpage < 0) {
+										$propalsignonspecificpage = $pagecount - abs($propalsignonspecificpage);
+									}
 
-									if (getDolGlobalString("PROPAL_SIGNATURE_ON_ALL_PAGES") || getDolGlobalInt("PROPAL_SIGNATURE_ON_SPECIFIC_PAGE") == $i) {
+									if (getDolGlobalString("PROPAL_SIGNATURE_ON_ALL_PAGES") || $propalsignonspecificpage == $i) {
 										// A signature image file is 720 x 180 (ratio 1/4) but we use only the size into PDF
 										// TODO Get position of box from PDF template