diff --git a/htdocs/public/paybox/paymentko.php b/htdocs/public/paybox/paymentko.php
index 58b678591cf..02047f07b9c 100644
--- a/htdocs/public/paybox/paymentko.php
+++ b/htdocs/public/paybox/paymentko.php
@@ -58,7 +58,7 @@ $langs->load("paypal");
  * View
  */
 
-dol_syslog("Callback url when a PayBox payment was canceled ".$_SERVER["QUERY_STRING"]);
+dol_syslog("Callback url when a PayBox payment was canceled. query_string=".$_SERVER["QUERY_STRING"]);
 
 llxHeaderPayBox($langs->trans("PaymentForm"));
 
diff --git a/htdocs/public/paybox/paymentok.php b/htdocs/public/paybox/paymentok.php
index c55bd3c49c2..86d9cc39891 100644
--- a/htdocs/public/paybox/paymentok.php
+++ b/htdocs/public/paybox/paymentok.php
@@ -57,7 +57,7 @@ $langs->load("paypal");
  * View
  */
 
-dol_syslog("Callback url when a PayBox payment was done ".$_SERVER["QUERY_STRING"]);
+dol_syslog("Callback url when a PayBox payment was done. query_string=".$_SERVER["QUERY_STRING"]);
 
 llxHeaderPayBox($langs->trans("PaymentForm"));
 
diff --git a/htdocs/public/paypal/paymentko.php b/htdocs/public/paypal/paymentko.php
index 42d25d55056..dd6f6f810dd 100755
--- a/htdocs/public/paypal/paymentko.php
+++ b/htdocs/public/paypal/paymentko.php
@@ -58,7 +58,7 @@ $langs->load("paypal");
  * View
  */
 
-dol_syslog("Callback url when a PayPal payment was canceled ".$_SERVER["QUERY_STRING"]);
+dol_syslog("Callback url when a PayPal payment was canceled. query_string=".$_SERVER["QUERY_STRING"]);
 
 llxHeaderPaypal($langs->trans("PaymentForm"));
 
diff --git a/htdocs/public/paypal/paymentok.php b/htdocs/public/paypal/paymentok.php
index c8642de3537..f9282e94794 100755
--- a/htdocs/public/paypal/paymentok.php
+++ b/htdocs/public/paypal/paymentok.php
@@ -88,7 +88,7 @@ if (empty($PAYPAL_API_SIGNATURE))
  * View
  */
 
-dol_syslog("Callback url when a PayPal payment was done ".$_SERVER["QUERY_STRING"]);
+dol_syslog("Callback url when a PayPal payment was done. query_string=".$_SERVER["QUERY_STRING"]);
 
 llxHeaderPaypal($langs->trans("PaymentForm"));