diff --git a/collects/setup/scribble-index.ss b/collects/setup/scribble-index.ss
index d780def8..5038e82c 100644
--- a/collects/setup/scribble-index.ss
+++ b/collects/setup/scribble-index.ss
@@ -65,7 +65,7 @@
     (map (lambda (doc)
            (parameterize ([current-namespace (namespace-anchor->empty-namespace here)])
              (with-handlers ([exn:fail? (lambda (exn) exn)])
-               (let ([r (with-input-from-file (build-path (doc-dest doc) "xref-out.ss")
+               (let ([r (with-input-from-file (build-path (doc-dest doc) "out.sxref")
                           read)])
                  (send renderer deserialize-info (cadr r) ci)))))
          docs)