diff --git a/pkgs/development/interpreters/python/cpython/2.7/default.nix b/pkgs/development/interpreters/python/cpython/2.7/default.nix
index fd3c63de1e72..f601fbc98085 100644
--- a/pkgs/development/interpreters/python/cpython/2.7/default.nix
+++ b/pkgs/development/interpreters/python/cpython/2.7/default.nix
@@ -162,7 +162,8 @@ in stdenv.mkDerivation {
         # needed for some packages, especially packages that backport
         # functionality to 2.x from 3.x
         for item in $out/lib/python${majorVersion}/test/*; do
-          if [[ "$item" != */test_support.py* ]]; then
+          if [[ "$item" != */test_support.py*
+             && "$item" != */regrtest.py* ]]; then
             rm -rf "$item"
           else
             echo $item
diff --git a/pkgs/development/interpreters/python/cpython/3.4/default.nix b/pkgs/development/interpreters/python/cpython/3.4/default.nix
index d00b91f316ff..3b375e147bce 100644
--- a/pkgs/development/interpreters/python/cpython/3.4/default.nix
+++ b/pkgs/development/interpreters/python/cpython/3.4/default.nix
@@ -111,7 +111,10 @@ in stdenv.mkDerivation {
     # needed for some packages, especially packages that backport functionality
     # to 2.x from 3.x
     for item in $out/lib/python${majorVersion}/test/*; do
-      if [[ "$item" != */test_support.py* ]]; then
+      if [[ "$item" != */test_support.py*
+         && "$item" != */test/support
+         && "$item" != */test/libregrtest
+         && "$item" != */test/regrtest.py* ]]; then
         rm -rf "$item"
       else
         echo $item
diff --git a/pkgs/development/interpreters/python/cpython/3.5/default.nix b/pkgs/development/interpreters/python/cpython/3.5/default.nix
index 1b71dba42c41..ed1170427c0a 100644
--- a/pkgs/development/interpreters/python/cpython/3.5/default.nix
+++ b/pkgs/development/interpreters/python/cpython/3.5/default.nix
@@ -105,7 +105,10 @@ in stdenv.mkDerivation {
     # needed for some packages, especially packages that backport functionality
     # to 2.x from 3.x
     for item in $out/lib/python${majorVersion}/test/*; do
-      if [[ "$item" != */test_support.py* ]]; then
+      if [[ "$item" != */test_support.py*
+         && "$item" != */test/support
+         && "$item" != */test/libregrtest
+         && "$item" != */test/regrtest.py* ]]; then
         rm -rf "$item"
       else
         echo $item
diff --git a/pkgs/development/interpreters/python/cpython/3.6/default.nix b/pkgs/development/interpreters/python/cpython/3.6/default.nix
index 0b0f9c8be6ab..127c093501c3 100644
--- a/pkgs/development/interpreters/python/cpython/3.6/default.nix
+++ b/pkgs/development/interpreters/python/cpython/3.6/default.nix
@@ -105,7 +105,10 @@ in stdenv.mkDerivation {
     # needed for some packages, especially packages that backport functionality
     # to 2.x from 3.x
     for item in $out/lib/python${majorVersion}/test/*; do
-      if [[ "$item" != */test_support.py* ]]; then
+      if [[ "$item" != */test_support.py*
+         && "$item" != */test/support
+         && "$item" != */test/libregrtest
+         && "$item" != */test/regrtest.py* ]]; then
         rm -rf "$item"
       else
         echo $item