lib/PublicInbox/GitHTTPBackend.pm | 2 +-

diff --git a/lib/PublicInbox/GitHTTPBackend.pm b/lib/PublicInbox/GitHTTPBackend.pm
index 4b3969346acefda27f49ffd47c5f0b26db49a1c6..937b2e9a295e0ddb974bfad1114cb997868c028f 100644
--- a/lib/PublicInbox/GitHTTPBackend.pm
+++ b/lib/PublicInbox/GitHTTPBackend.pm
@@ -130,7 +130,7 @@ 		$len = $end - $beg + 1;
 		if ($len <= 0) {
 			$code = 416;
 		} else {
-			seek($in, $beg, SEEK_SET) or return [ 500, [], [] ];
+			sysseek($in, $beg, SEEK_SET) or return [ 500, [], [] ];
 			push @$h, qw(Accept-Ranges bytes Content-Range);
 			push @$h, "bytes $beg-$end/$size";