diff --git a/ocaml-rpm-macros.changes b/ocaml-rpm-macros.changes
index 7df37ba..c106a1a 100644
--- a/ocaml-rpm-macros.changes
+++ b/ocaml-rpm-macros.changes
@@ -7,6 +7,7 @@ Mon Sep 30 14:15:16 UTC 2019 - ohering@suse.de
 - Provide a ocaml_create_file_list macro
 - Optional extra args for dune commands
 - Pass --verbose to dune commands
+- Move prefix/man to datadir/man to workaround bug in dune (#2670)
 
 -------------------------------------------------------------------
 Mon Sep 30 12:34:56 UTC 2019 - ohering@suse.de
diff --git a/ocaml-rpm-macros.spec b/ocaml-rpm-macros.spec
index 59e285e..b1099f2 100644
--- a/ocaml-rpm-macros.spec
+++ b/ocaml-rpm-macros.spec
@@ -206,7 +206,11 @@ ocaml setup.ml -configure \\\
 	ulimit -s $((1024 * 64)) ; \
 %endif
 	dune install --verbose --destdir=%%{buildroot} $OCAML_DUNE_INSTALL_ARGS ; \
-	rm -rfv %%{buildroot}%%{_prefix}/doc
+	rm -rfv %%{buildroot}%%{_prefix}/doc ; \
+	if test -d %%{buildroot}%%{_prefix}/man ; then \
+		mkdir -vp %%{buildroot}%%{_datadir} ; \
+		mv -vt %%{buildroot}%%{_datadir} %%{buildroot}%%{_prefix}/man ; \
+	fi ;
 %%ocaml_dune_test \
 %ifarch ppc64 ppc64le
 	ulimit -s $((1024 * 64)) ; \