diff --git a/fileutils-0.5.2-fix-bytes.patch b/fileutils-0.5.2-fix-bytes.patch
new file mode 100644
index 0000000..cd0011d
--- /dev/null
+++ b/fileutils-0.5.2-fix-bytes.patch
@@ -0,0 +1,20 @@
+--- ocaml-fileutils-0.5.2.old/src/FileUtilCP.ml	2017-05-23 21:12:19.000000000 +0100
++++ ocaml-fileutils-0.5.2/src/FileUtilCP.ml	2017-11-08 17:36:42.271524209 +0000
+@@ -138,7 +138,7 @@
+     end
+   in
+ 
+-  let buffer = String.make 1024 ' ' in
++  let buffer = Bytes.make 1024 ' ' in
+ 
+   let cp_file st_src dst_exists fn_src fn_dst =
+     let mode = int_of_permission st_src.permission in
+@@ -176,7 +176,7 @@
+           try
+             while (read :=
+                    handle_exception
+-                     (Unix.read fd_src buffer 0) (String.length buffer)
++                     (Unix.read fd_src buffer 0) (Bytes.length buffer)
+                      (fun e -> `ErrorRead(fn_src, e));
+                    !read <> 0) do
+               let written =
diff --git a/ocaml-fileutils.spec b/ocaml-fileutils.spec
index 9862385..1669dde 100644
--- a/ocaml-fileutils.spec
+++ b/ocaml-fileutils.spec
@@ -7,6 +7,8 @@ License:        LGPLv2 with exceptions
 URL:            https://forge.ocamlcore.org/projects/ocaml-fileutils/
 Source0:        http://forge.ocamlcore.org/frs/download.php/1695/ocaml-fileutils-0.5.2.tar.gz
 
+Patch1:         fileutils-0.5.2-fix-bytes.patch
+
 BuildRequires:  ocaml >= 4.00.1
 BuildRequires:  ocaml-findlib-devel >= 1.3.3-3
 BuildRequires:  ocaml-ocamldoc
@@ -39,16 +41,17 @@ developing applications that use %{name}.
 
 %prep
 %setup -q
-
-# Disable the tests (RHEL 7 only) since they require ocaml-ounit.
-%if 0%{?rhel} >= 7
-rm test/test.ml
-touch test/test.ml
-%endif
+%autopatch -p1
 
 
 %build
-ocaml setup.ml -configure --prefix %{_prefix} --destdir $RPM_BUILD_ROOT
+# Disable the tests (RHEL 7 only) since they require ocaml-ounit.
+ocaml setup.ml -configure --prefix %{_prefix} --destdir $RPM_BUILD_ROOT \
+%if 0%{?rhel} >= 7
+	--disable-tests
+%else
+	--enable-tests
+%endif
 make
 
 
@@ -63,7 +66,9 @@ make htmldir=. install
 
 
 %check
+%if ! 0%{?rhel} >= 7
 make test
+%endif
 
 
 %files