diff --git a/C4/Auth.pm b/C4/Auth.pm
index 5aa946f460..d6f4d3b138 100644
--- a/C4/Auth.pm
+++ b/C4/Auth.pm
@@ -1200,6 +1200,7 @@ sub checkauth {
                         # we have to check they are coming from the right ip range
                         my $domain = $branches->{$branchcode}->{'branchip'};
                         $domain =~ s|\.\*||g;
+                        $domain =~ s/\s+//g;
                         if ( $ip !~ /^$domain/ ) {
                             $cookie = $cookie_mgr->replace_in_list( $cookie, $query->cookie(
                                 -name     => 'CGISESSID',