diff --git a/gnu/packages/haskell.scm b/gnu/packages/haskell.scm
index f153b48034..170d3bdc5d 100644
--- a/gnu/packages/haskell.scm
+++ b/gnu/packages/haskell.scm
@@ -7207,6 +7207,13 @@ the @code{conduit} package.")
     (arguments
      `(#:phases
        (modify-phases %standard-phases
+         ;; Many YAML tests (44) are failing do to changes in ghc-yaml:
+         ;; <https://github.com/jgm/pandoc-citeproc/issues/342>.
+         (add-before 'configure 'patch-tests
+           (lambda _
+             (substitute* "tests/test-pandoc-citeproc.hs"
+               (("let allTests = citeprocTests \\+\\+ biblio2yamlTests")
+                "let allTests = citeprocTests"))))
          ;; Tests need to be run after installation.
          (delete 'check)
          (add-after 'install 'post-install-check