diff --git a/apron.spec b/apron.spec
index 6bccb60..7bb5858 100644
--- a/apron.spec
+++ b/apron.spec
@@ -41,6 +41,7 @@ BuildRequires:  ocaml-ocamldoc
 BuildRequires:  perl-interpreter
 BuildRequires:  tex(adjustbox.sty)
 BuildRequires:  tex(fullpage.sty)
+BuildRequires:  tex(hanging.sty)
 BuildRequires:  tex(tabu.sty)
 BuildRequires:  texinfo-tex