diff --git a/dev-python/numexpr/numexpr-2.4.3.ebuild b/dev-python/numexpr/numexpr-2.4.3.ebuild
index 34acc36cf1503..3e8710d5b0775 100644
--- a/dev-python/numexpr/numexpr-2.4.3.ebuild
+++ b/dev-python/numexpr/numexpr-2.4.3.ebuild
@@ -5,6 +5,7 @@
 EAPI=5
 
 PYTHON_COMPAT=( python{2_7,3_3,3_4} )
+PYTHON_REQ_USE="threads(+)"
 
 inherit distutils-r1
 
diff --git a/dev-python/numexpr/numexpr-2.4.4.ebuild b/dev-python/numexpr/numexpr-2.4.4.ebuild
index d264e55baa756..ae5fbec895869 100644
--- a/dev-python/numexpr/numexpr-2.4.4.ebuild
+++ b/dev-python/numexpr/numexpr-2.4.4.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/numexpr/numexpr-2.4.6.ebuild b/dev-python/numexpr/numexpr-2.4.6.ebuild
index d264e55baa756..ae5fbec895869 100644
--- a/dev-python/numexpr/numexpr-2.4.6.ebuild
+++ b/dev-python/numexpr/numexpr-2.4.6.ebuild
@@ -5,6 +5,7 @@
 EAPI=5
 
 PYTHON_COMPAT=( python2_7 python3_{3,4,5} )
+PYTHON_REQ_USE="threads(+)"
 
 inherit distutils-r1