diff --git a/Koha/Patron.pm b/Koha/Patron.pm
index 7531b3fbf0..7233b24f13 100644
--- a/Koha/Patron.pm
+++ b/Koha/Patron.pm
@@ -3755,16 +3755,16 @@ ISO string representation, and sensitive/noisy fields are excluded.
 
 sub _unblessed_for_log {
     my ($self) = @_;
-    my $data = $self->unblessed;
-    delete @{$data}{qw(password lastseen updated_on)};
-    for my $key ( keys %$data ) {
-        if ( defined $data->{$key} && $data->{$key} ne '' ) {
-            $data->{$key} = "$data->{$key}" if blessed( $data->{$key} );
-        } else {
-            delete $data->{$key};
-        }
+
+    # Use get_column rather than unblessed to avoid DBIC column inflation:
+    # date/datetime values are returned as raw ISO strings directly, without
+    # constructing DateTime objects that we would only immediately stringify.
+    my %data = map { $_ => $self->get_column($_) } $self->result_source->columns;
+    delete @data{qw(password lastseen updated_on)};
+    for my $key ( keys %data ) {
+        delete $data{$key} unless defined $data{$key} && $data{$key} ne '';
     }
-    return $data;
+    return \%data;
 }
 
 =head1 AUTHORS