diff --git a/gnu/packages/haskell-crypto.scm b/gnu/packages/haskell-crypto.scm
index b1db19bdeb..87e6cd3c15 100644
--- a/gnu/packages/haskell-crypto.scm
+++ b/gnu/packages/haskell-crypto.scm
@@ -238,7 +238,9 @@ (define-public ghc-cryptohash-sha1
          "1aqdxdhxhl9jldh951djpwxx8z7gzaqspxl7iwpl84i5ahrsyy9w"))))
     (build-system haskell-build-system)
     (arguments
-     `(#:tests? #f)) ; tests require old version of ghc-hunit (0.9)
+     `(#:cabal-revision
+       ("2" "0xas0nbq9bfdzlj6k565ibizv1cqvzfzsdj6q9pdiiwyxqblqc3m")
+       #:tests? #f)) ; tests require old version of ghc-hunit (0.9)
     (native-inputs `(("ghc-base16-bytestring" ,ghc-base16-bytestring)
                      ("ghc-sha" ,ghc-sha)
                      ("ghc-tasty" ,ghc-tasty)