diff -Naur a/build-aux/update-copyright b/build-aux/update-copyright
--- a/build-aux/update-copyright	2011-03-01 17:39:26.000000000 +0100
+++ b/build-aux/update-copyright	2015-07-17 12:24:54.419126596 +0200
@@ -121,7 +121,7 @@
 use warnings;
 
 my $copyright_re = 'Copyright';
-my $circle_c_re = '(?:\([cC]\)|@copyright{}|©)';
+my $circle_c_re = '(?:\([cC]\)|@copyright\{\}|©)';
 my $holder = $ENV{UPDATE_COPYRIGHT_HOLDER};
 $holder ||= 'Free Software Foundation, Inc.';
 my $prefix_max = 5;