diff --git a/dev-python/matplotlib/matplotlib-1.4.2.ebuild b/dev-python/matplotlib/matplotlib-1.4.2.ebuild
index b09070184f081..db8a59b5eece3 100644
--- a/dev-python/matplotlib/matplotlib-1.4.2.ebuild
+++ b/dev-python/matplotlib/matplotlib-1.4.2.ebuild
@@ -6,7 +6,7 @@ EAPI=5
 
 PYTHON_COMPAT=( python{2_7,3_3,3_4} )
 
-PYTHON_REQ_USE='tk?'
+PYTHON_REQ_USE='tk?,threads(+)'
 
 inherit distutils-r1 eutils flag-o-matic virtualx
 
diff --git a/dev-python/matplotlib/matplotlib-1.4.3.ebuild b/dev-python/matplotlib/matplotlib-1.4.3.ebuild
index 507da5be13c3a..538ff933f024d 100644
--- a/dev-python/matplotlib/matplotlib-1.4.3.ebuild
+++ b/dev-python/matplotlib/matplotlib-1.4.3.ebuild
@@ -6,7 +6,7 @@ EAPI=5
 
 PYTHON_COMPAT=( python2_7 python3_{3,4,5} )
 
-PYTHON_REQ_USE='tk?'
+PYTHON_REQ_USE='tk?,threads(+)'
 
 inherit distutils-r1 eutils flag-o-matic virtualx toolchain-funcs
 
diff --git a/dev-python/matplotlib/matplotlib-1.5.0.ebuild b/dev-python/matplotlib/matplotlib-1.5.0.ebuild
index b32275d0116b1..db96ac7d0a97d 100644
--- a/dev-python/matplotlib/matplotlib-1.5.0.ebuild
+++ b/dev-python/matplotlib/matplotlib-1.5.0.ebuild
@@ -6,7 +6,7 @@ EAPI=5
 
 PYTHON_COMPAT=( python2_7 python3_{3,4,5} )
 
-PYTHON_REQ_USE='tk?'
+PYTHON_REQ_USE='tk?,threads(+)'
 
 inherit distutils-r1 eutils flag-o-matic virtualx toolchain-funcs
 
diff --git a/dev-python/matplotlib/matplotlib-9999.ebuild b/dev-python/matplotlib/matplotlib-9999.ebuild
index 1bde41e63e17a..bad2f740c7aea 100644
--- a/dev-python/matplotlib/matplotlib-9999.ebuild
+++ b/dev-python/matplotlib/matplotlib-9999.ebuild
@@ -6,7 +6,7 @@ EAPI=5
 
 PYTHON_COMPAT=( python2_7 python3_{3,4,5} )
 
-PYTHON_REQ_USE='tk?'
+PYTHON_REQ_USE='tk?,threads(+)'
 
 inherit distutils-r1 eutils flag-o-matic git-r3 virtualx toolchain-funcs