diff --git a/C4/Overdues.pm b/C4/Overdues.pm
index e1c2c9f28a..7893a708a3 100644
--- a/C4/Overdues.pm
+++ b/C4/Overdues.pm
@@ -228,11 +228,12 @@ sub CalcFine {
     my @fines = grep { defined $_ } Koha::Plugins->call(
         'overwrite_calc_fine',
         {
-            itemnumber   => $item->{itemnumber},
-            categorycode => $bortype,
-            branchcode   => $branchcode,
-            due_date     => $due_dt,
-            end_date     => $end_date,
+            itemnumber     => $item->{itemnumber},
+            borrowernumber => $item->{borrowernumber},
+            categorycode   => $bortype,
+            branchcode     => $branchcode,
+            due_date       => $due_dt,
+            end_date       => $end_date,
         }
     );
 
diff --git a/t/db_dependent/Koha/Plugins/Overdues.t b/t/db_dependent/Koha/Plugins/Overdues.t
index edde9f9d12..d044817c17 100755
--- a/t/db_dependent/Koha/Plugins/Overdues.t
+++ b/t/db_dependent/Koha/Plugins/Overdues.t
@@ -54,6 +54,7 @@ subtest 'overwrite_calc_fine hook tests' => sub {
     my $library  = $builder->build_object( { class => 'Koha::Libraries', } );
     my $category = $builder->build_object( { class => 'Koha::Patron::Categories', } );
     my $item     = $builder->build_sample_item;
+    my $patron   = $builder->build_object( { class => 'Koha::Patrons', } );
 
     Koha::Plugins->new->InstallPlugins();
     my $test_plugin = Koha::Plugin::Test->new->disable();
@@ -129,13 +130,18 @@ subtest 'overwrite_calc_fine hook tests' => sub {
     $empty_value_plugin->disable();
     $bad_value_plugin->disable();
 
+    my $borrowernumber = $patron->borrowernumber;
+    my $overdue        = $item->unblessed;
+    $overdue->{borrowernumber} = $borrowernumber;
+
     my $itemnumber   = $item->itemnumber;
     my $branchcode   = $library->branchcode;
     my $categorycode = $category->categorycode;
 
-    warnings_like { CalcFine( $item->unblessed, $category->categorycode, $library->branchcode, $due_date, $end_date ); }
+    warnings_like { CalcFine( $overdue, $category->categorycode, $library->branchcode, $due_date, $end_date ); }
     [
         qr/itemnumber:$itemnumber/,
+        qr/borrowernumber:$borrowernumber/,
         qr/branchcode:$branchcode/,
         qr/categorycode:$categorycode/,
         qr/due_date_type:DateTime/,
diff --git a/t/lib/plugins/Koha/Plugin/Test.pm b/t/lib/plugins/Koha/Plugin/Test.pm
index 045fdce29f..b24301166b 100644
--- a/t/lib/plugins/Koha/Plugin/Test.pm
+++ b/t/lib/plugins/Koha/Plugin/Test.pm
@@ -458,6 +458,7 @@ sub overwrite_calc_fine {
     my ( $self, $params ) = @_;
 
     warn "itemnumber:" . $params->{itemnumber};
+    warn "borrowernumber:" . $params->{borrowernumber};
     warn "branchcode:" . $params->{branchcode};
     warn "categorycode:" . $params->{categorycode};
     warn "due_date_type:" . ref( $params->{due_date} );