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diff --git a/lib/Lintian/Check/Fields/MultiLine.pm b/lib/Lintian/Check/Fields/MultiLine.pm
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+++ b/lib/Lintian/Check/Fields/MultiLine.pm
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+# fields/multi-line -- lintian check script -*- perl -*-
+#
+# Copyright (C) 2019 Felix Lechner
+#
+# Parts of the code were taken from the old check script, which
+# was Copyright (C) 1998 Richard Braakman (also licensed under the
+# GPL 2 or higher)
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, you can find it on the World Wide
+# Web at https://www.gnu.org/copyleft/gpl.html, or write to the Free
+# Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+# MA 02110-1301, USA.
+
+package Lintian::Check::Fields::MultiLine;
+
+use v5.20;
+use warnings;
+use utf8;
+
+use Const::Fast;
+use List::Compare;
+
+use Moo;
+use namespace::clean;
+
+with 'Lintian::Check';
+
+const my $NEWLINE => qq{\n};
+
+# based on policy 5.6
+my @always_single = (
+    qw(Architecture Bugs Changed-By Closes Date Distribution Dm-Upload-Allowed),
+    qw(Essential Format Homepage Installed-Size Installer-Menu-Item Maintainer),
+    qw(Multi-Arch Origin Package Priority Section Source Standards-Version),
+    qw(Subarchitecture Urgency Version)
+);
+
+my @package_relations
+  = (
+    qw(Depends Pre-Depends Recommends Suggests Conflicts Provides Enhances Replaces Breaks)
+  );
+
+sub always {
+    my ($self) = @_;
+
+    my @banned = @always_single;
+
+    # for package relations, multi-line only in source (policy 7.1)
+    push(@banned, @package_relations)
+      unless $self->processable->type eq 'source';
+
+    my @present = $self->processable->fields->names;
+
+    my $single_lc = List::Compare->new(\@present, \@banned);
+    my @enforce = $single_lc->get_intersection;
+
+    for my $name (@enforce) {
+
+        my $value = $self->processable->fields->untrimmed_value($name);
+
+        # remove a final newline, if any
+        $value =~ s/\n$//;
+
+        # check if fields have newlines in them
+        $self->hint('multiline-field', $name)
+          if index($value, $NEWLINE) >= 0;
+    }
+
+    return;
+}
+
+1;
+
+# Local Variables:
+# indent-tabs-mode: nil
+# cperl-indent-level: 4
+# End:
+# vim: syntax=perl sw=4 sts=4 sr et