lib/PublicInbox/Inbox.pm | 4 ++--
 t/solver_git.t           | 2 +-

diff --git a/lib/PublicInbox/Inbox.pm b/lib/PublicInbox/Inbox.pm
index 6fe896f49efeb64a6a9fe364763aca2cbaa54c54..cde46258d02d630135f4efb12ba7b3d94178462e 100644
--- a/lib/PublicInbox/Inbox.pm
+++ b/lib/PublicInbox/Inbox.pm
@@ -202,8 +202,8 @@ }
 
 sub base_url {
 	my ($self, $env) = @_;
-	if ($env) { # PSGI env
-		my $scheme = $env->{'psgi.url_scheme'};
+	my $scheme;
+	if ($env && ($scheme = $env->{'psgi.url_scheme'})) { # PSGI env
 		my $host_port = $env->{HTTP_HOST} ||
 			"$env->{SERVER_NAME}:$env->{SERVER_PORT}";
 		my $url = "$scheme://$host_port". ($env->{SCRIPT_NAME} || '/');
diff --git a/t/solver_git.t b/t/solver_git.t
index 66e63176161ccee64223cdf85b247b25235ec339..8de63988e9c51ce677a41b2e9752891b8824f2cc 100644
--- a/t/solver_git.t
+++ b/t/solver_git.t
@@ -44,7 +44,7 @@ $ibx->{-repo_objs} = [ PublicInbox::Git->new($git_dir) ];
 my $res;
 my $solver = PublicInbox::SolverGit->new($ibx, sub { $res = $_[0] });
 open my $log, '+>>', "$mainrepo/solve.log" or die "open: $!";
-my $psgi_env = { 'psgi.url_scheme' => 'http', HTTP_HOST => 'example.com' };
+my $psgi_env = { 'psgi.errors' => *STDERR };
 $solver->solve($psgi_env, $log, '69df7d5', {});
 ok($res, 'solved a blob!');
 my $wt_git = $res->[0];