diff --git a/gnu/packages/crates-io.scm b/gnu/packages/crates-io.scm
index 6a40f7cf4f..0ce1473f76 100644
--- a/gnu/packages/crates-io.scm
+++ b/gnu/packages/crates-io.scm
@@ -38385,14 +38385,7 @@ uses finite automata and guarantees linear time matching on all inputs.")
         (file-name (string-append name "-" version ".tar.gz"))
         (sha256
          (base32
-          "1rzqbsgkmr053bxxl04vmvsd1njyz0nxvly97aip6aa2cmb15k9s"))
-       (modules '((guix build utils)))
-       (snippet
-        '(begin
-           ;; 'doctest' isn't stable until rust-1.40
-           (substitute* "src/lib.rs"
-             (("\\(doctest") "(test"))
-           #t))))
+          "1rzqbsgkmr053bxxl04vmvsd1njyz0nxvly97aip6aa2cmb15k9s"))))
     (build-system cargo-build-system)
     (arguments
      `(#:cargo-inputs