diff --git a/ocaml-lwt.spec b/ocaml-lwt.spec
index c0a2638..b8f4316 100644
--- a/ocaml-lwt.spec
+++ b/ocaml-lwt.spec
@@ -1,6 +1,6 @@
 Name:           ocaml-lwt
 Version:        4.2.1
-Release:        4%{?dist}
+Release:        5%{?dist}
 Summary:        OCaml lightweight thread library
 
 # The openssl linking exception is granted.
@@ -37,6 +37,10 @@ is part of the Ocsigen project.
 %package        devel
 Summary:        Development files for %{name}
 Requires:       %{name}%{?_isa} = %{version}-%{release}
+# This is probably a packaging or dependency bug, but if we don't
+# have it then any package that builds using LWT fails with:
+# ocamlfind: Package `seq' not found - required by `lwt'
+Requires:       ocaml-seq-devel%{?_isa} = %{version}-%{release}
 
 %description    devel
 The %{name}-devel package contains libraries and signature files for
@@ -174,6 +178,9 @@ rm -rf %{buildroot}/%{_prefix}/doc
 
 
 %changelog
+* Fri Aug 16 2019 Richard W.M. Jones <rjones@redhat.com> - 4.2.1-5
+- Add Requires: ocaml-seq-devel to devel subpackage.
+
 * Fri Aug 16 2019 Richard W.M. Jones <rjones@redhat.com> - 4.2.1-4
 - OCaml 4.08.1 (final) rebuild.