diff --git a/libguestfs.changes b/libguestfs.changes
index e03de3f..9a6885a 100644
--- a/libguestfs.changes
+++ b/libguestfs.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Wed Apr 13 20:48:37 UTC 2022 - Hans-Peter Jansen <hpj@urpla.net>
+
+- Avoid useless builds, if ocaml version isn't up to the task
+  libguestfs uses get_uint8(), available since ocaml 4.13.0
+
 -------------------------------------------------------------------
 Thu Mar 17 15:45:02 MDT 2022 - carnold@suse.com
 
diff --git a/libguestfs.spec b/libguestfs.spec
index c4155d6..1fb9caf 100644
--- a/libguestfs.spec
+++ b/libguestfs.spec
@@ -40,7 +40,7 @@ BuildRequires:  gcc-c++
 BuildRequires:  gobject-introspection-devel
 BuildRequires:  gperf
 BuildRequires:  libtool
-BuildRequires:  ocaml
+BuildRequires:  ocaml >= 4.13
 BuildRequires:  ocaml-hivex-devel
 BuildRequires:  pkgconf-pkg-config
 BuildRequires:  po4a