diff --git a/C4/SIP/ILS/Patron.pm b/C4/SIP/ILS/Patron.pm
index e840b3f0ef..f4571be38d 100644
--- a/C4/SIP/ILS/Patron.pm
+++ b/C4/SIP/ILS/Patron.pm
@@ -160,6 +160,7 @@ sub new {
 
 my %fields = (
     id                      => 0,
+    borrowernumber          => 0,
     name                    => 0,
     address                 => 0,
     email_addr              => 0,