diff --git a/gnu/packages/ocaml.scm b/gnu/packages/ocaml.scm
index 82a2aac812..0948377d08 100644
--- a/gnu/packages/ocaml.scm
+++ b/gnu/packages/ocaml.scm
@@ -478,7 +478,8 @@ for building OCaml library and programs.")
              (url "https://github.com/xavierleroy/camlidl")
              (commit "camlidl109")))
        (sha256
-        (base32 "0zrkaq7fk23b2b9vg6jwdjx7l0hdqp4synbbrw1zcg8gjf6n3c80"))))
+        (base32 "0zrkaq7fk23b2b9vg6jwdjx7l0hdqp4synbbrw1zcg8gjf6n3c80"))
+       (file-name (git-file-name name version))))
     (build-system gnu-build-system)
     (arguments
      `(#:tests? #f ;; No test suite
@@ -493,10 +494,10 @@ for building OCaml library and programs.")
          (delete 'configure)
          (replace 'build
            (lambda _
-             (let* ((cores  (parallel-job-count))
-                    (dash-j (format #f "-j~a" cores)))
-               (copy-file "config/Makefile.unix" "config/Makefile")
-               (invoke "make" dash-j "all"))
+             (copy-file "config/Makefile.unix" "config/Makefile")
+             ;; Note: do not pass '-jN' as this appears to not be
+             ;; parallel-safe (race condition related to libcamlidl.a).
+             (invoke "make" "all")
              #t))
          (add-before 'install 'create-target-directories
            (lambda* (#:key outputs #:allow-other-keys)