diff --git a/python-billiard.spec b/python-billiard.spec
index 0645a36..5e63ff9 100644
--- a/python-billiard.spec
+++ b/python-billiard.spec
@@ -27,6 +27,7 @@ BuildRequires:  python2-setuptools
 BuildRequires:  python2-mock
 BuildRequires:  python2-pytest
 BuildRequires:  python2-case
+BuildRequires:  python2-unittest2
 %endif
 BuildRequires:  gcc
 
@@ -52,6 +53,7 @@ BuildRequires:  python3-setuptools
 BuildRequires:  python3-mock
 BuildRequires:  python3-pytest
 BuildRequires:  python3-case
+BuildRequires:  python3-unittest2
 %endif
 
 %description -n python3-%{srcname}