lib/PublicInbox/Spawn.pm | 12 +-----------
 t/spawn.t                | 10 ----------

diff --git a/lib/PublicInbox/Spawn.pm b/lib/PublicInbox/Spawn.pm
index b946a66373b84faedaef1a71d02329a2cf8587fe..6493ad387cdbcb915ca71fcbdc325f0ce673f768 100644
--- a/lib/PublicInbox/Spawn.pm
+++ b/lib/PublicInbox/Spawn.pm
@@ -193,17 +193,7 @@ 	defined $f or die "$cmd->[0]: command not found\n";
 	my @env;
 	$opts ||= {};
 
-	my %env = $opts->{-env} ? () : %ENV;
-	if ($env) {
-		foreach my $k (keys %$env) {
-			my $v = $env->{$k};
-			if (defined $v) {
-				$env{$k} = $v;
-			} else {
-				delete $env{$k};
-			}
-		}
-	}
+	my %env = $env ? (%ENV, %$env) : %ENV;
 	while (my ($k, $v) = each %env) {
 		push @env, "$k=$v";
 	}
diff --git a/t/spawn.t b/t/spawn.t
index ebebfb57eafc078577c4b79bc6021fce8d6c4846..2e4091574e1be4bcbafd91ff851f0938f60557ef 100644
--- a/t/spawn.t
+++ b/t/spawn.t
@@ -39,16 +39,6 @@ 	is($?, 0, 'sh exited successfully');
 }
 
 {
-	my ($r, $w);
-	pipe $r, $w or die "pipe failed: $!";
-	my $pid = spawn(['env'], {}, { -env => 1, 1 => fileno($w) });
-	close $w or die "close pipe[1] failed: $!";
-	ok(!defined(<$r>), 'read stdout of spawned from pipe');
-	is(waitpid($pid, 0), $pid, 'waitpid succeeds on spawned process');
-	is($?, 0, 'env(1) exited successfully');
-}
-
-{
 	my $fh = popen_rd([qw(echo hello)]);
 	ok(fileno($fh) >= 0, 'tied fileno works');
 	my $l = <$fh>;