lib/PublicInbox/ViewDiff.pm | 8 ++------

diff --git a/lib/PublicInbox/ViewDiff.pm b/lib/PublicInbox/ViewDiff.pm
index b91156692976849ac26474c4c35c2acde79c4bd6..fba3d76c7b0cc10473261380c081301f93b5b119 100644
--- a/lib/PublicInbox/ViewDiff.pm
+++ b/lib/PublicInbox/ViewDiff.pm
@@ -124,12 +124,8 @@ 	if ($pa eq $pb && $pb ne '/dev/null') {
 		$dctx->{Q} = '?b='.uri_escape_path($pb);
 	} else {
 		my @q;
-		if ($pb ne '/dev/null') {
-			push @q, 'b='.uri_escape_path($pb);
-		}
-		if ($pa ne '/dev/null') {
-			push @q, 'a='.uri_escape_path($pa);
-		}
+		push @q, 'b='.uri_escape_path($pb) if $pb ne '/dev/null';
+		push @q, 'a='.uri_escape_path($pa) if $pa ne '/dev/null';
 		$dctx->{Q} = '?'.join('&', @q);
 	}