diff --git a/cgi/reset_password.pl b/cgi/reset_password.pl
index ac71be2e5d6e2..0e99adb7ccb8d 100755
--- a/cgi/reset_password.pl
+++ b/cgi/reset_password.pl
@@ -73,6 +73,10 @@
 
 		if ($id =~ /\@/) {
 			my $emails_ref = retrieve("$data_root/users_emails.sto");
+			if (not defined $emails_ref->{$id}) {
+				# not found, try with lower case email
+				$id = lc $id;
+			}
 			if (not defined $emails_ref->{$id}) {
 				push @errors, $Lang{error_reset_unknown_email}{$lang};
 			}