diff --git a/pdf-stapler.spec b/pdf-stapler.spec
index 51cea53..f9c4ec0 100644
--- a/pdf-stapler.spec
+++ b/pdf-stapler.spec
@@ -14,6 +14,7 @@ Source2:        stapler-%{version}.tar.bz2
 BuildArch:      noarch
 BuildRequires:  python3-devel
 BuildRequires:  python3-setuptools
+BuildRequires:       python3-more-itertools
 Requires:       python3-staplelib = %{version}-%{release}
 
 %description