diff --git a/dev-python/pytz/pytz-2015.4.ebuild b/dev-python/pytz/pytz-2015.4.ebuild
index 3bee4d2ef4b8d..2ed202a114411 100644
--- a/dev-python/pytz/pytz-2015.4.ebuild
+++ b/dev-python/pytz/pytz-2015.4.ebuild
@@ -5,6 +5,7 @@
 EAPI=5
 
 PYTHON_COMPAT=( python2_7 python3_{3,4} pypy pypy3 )
+PYTHON_REQ_USE="threads(+)"
 
 inherit distutils-r1
 
diff --git a/dev-python/pytz/pytz-2015.6.ebuild b/dev-python/pytz/pytz-2015.6.ebuild
index 8cb53a7b9c8e1..71f75704433df 100644
--- a/dev-python/pytz/pytz-2015.6.ebuild
+++ b/dev-python/pytz/pytz-2015.6.ebuild
@@ -5,6 +5,7 @@
 EAPI=5
 
 PYTHON_COMPAT=( python2_7 python3_{3,4,5} pypy pypy3 )
+PYTHON_REQ_USE="threads(+)"
 
 inherit distutils-r1
 
diff --git a/dev-python/pytz/pytz-2015.7.ebuild b/dev-python/pytz/pytz-2015.7.ebuild
index 33cf03a3fd830..0e6fd7f7338bd 100644
--- a/dev-python/pytz/pytz-2015.7.ebuild
+++ b/dev-python/pytz/pytz-2015.7.ebuild
@@ -5,6 +5,7 @@
 EAPI=5
 
 PYTHON_COMPAT=( python2_7 python3_{3,4,5} pypy pypy3 )
+PYTHON_REQ_USE="threads(+)"
 
 inherit distutils-r1