diff --git a/dev-python/pycrypto/pycrypto-2.6.1-r1.ebuild b/dev-python/pycrypto/pycrypto-2.6.1-r1.ebuild
index ca145a85e4a2f..1bac6f17c82e8 100644
--- a/dev-python/pycrypto/pycrypto-2.6.1-r1.ebuild
+++ b/dev-python/pycrypto/pycrypto-2.6.1-r1.ebuild
@@ -5,6 +5,7 @@
 EAPI=5
 
 PYTHON_COMPAT=( python2_7 python3_{3,4,5} )
+PYTHON_REQ_USE="threads(+)"
 
 inherit distutils-r1
 
diff --git a/dev-python/pycrypto/pycrypto-2.6.1.ebuild b/dev-python/pycrypto/pycrypto-2.6.1.ebuild
index 5e7504e20ac7e..a2285a22c6e41 100644
--- a/dev-python/pycrypto/pycrypto-2.6.1.ebuild
+++ b/dev-python/pycrypto/pycrypto-2.6.1.ebuild
@@ -5,6 +5,7 @@
 EAPI=5
 
 PYTHON_COMPAT=( python{2_7,3_3,3_4} )
+PYTHON_REQ_USE="threads(+)"
 
 inherit distutils-r1