diff --git a/ocaml-calendar.spec b/ocaml-calendar.spec
index 7f5f04f..b34b2aa 100644
--- a/ocaml-calendar.spec
+++ b/ocaml-calendar.spec
@@ -13,6 +13,7 @@ Source0:        https://forge.ocamlcore.org/frs/download.php/1481/calendar-2.04.
 
 Patch1:         calendar-2.03.2-enable-debug.patch
 
+BuildRequires: make
 BuildRequires:  ocaml >= 4.00.1
 BuildRequires:  ocaml-findlib-devel >= 1.3.3-3
 BuildRequires:  ocaml-ocamldoc