diff --git a/rpy.spec b/rpy.spec
index 7f90ef3..68929b5 100644
--- a/rpy.spec
+++ b/rpy.spec
@@ -13,11 +13,12 @@ License:       GPLv2+
 Url:           https://pypi.python.org/pypi/rpy2
 Source:        https://files.pythonhosted.org/packages/source/r/%{srcname}2/%{srcname}2-%{version}.tar.gz
 
-BuildRequires: R-devel = %{rver}, numpy
+BuildRequires: R-devel = %{rver}
 %if %{python2}
 BuildRequires: python-setuptools, python2-devel
 %endif
-BuildRequires: python3-setuptools, python3-devel
+BuildRequires: python3-setuptools, python3-devel, python3-cffi
+BuildRequires: python3-numpy
 BuildRequires: readline-devel
 
 Requires:      python3-%{srcname} = %{version}-%{release}