diff --git a/pkgs/development/python-modules/stringly/default.nix b/pkgs/development/python-modules/stringly/default.nix
index 7d830ff2f839..c7637bb082c7 100644
--- a/pkgs/development/python-modules/stringly/default.nix
+++ b/pkgs/development/python-modules/stringly/default.nix
@@ -1,6 +1,5 @@
 {
   lib,
-  python,
   buildPythonPackage,
   fetchPypi,
   typing-extensions,
@@ -20,10 +19,6 @@ buildPythonPackage rec {
 
   propagatedBuildInputs = [ typing-extensions ];
 
-  checkPhase = ''
-    ${python.interpreter} -m unittest
-  '';
-
   meta = with lib; {
     description = "Stringly: Human Readable Object Serialization";
     homepage = "https://github.com/evalf/stringly";
diff --git a/pkgs/development/python-modules/treelog/default.nix b/pkgs/development/python-modules/treelog/default.nix
index 87ef2eca9f14..7739b8253bb4 100644
--- a/pkgs/development/python-modules/treelog/default.nix
+++ b/pkgs/development/python-modules/treelog/default.nix
@@ -1,6 +1,5 @@
 {
   lib,
-  python,
   buildPythonPackage,
   fetchPypi,
   typing-extensions,
@@ -20,10 +19,6 @@ buildPythonPackage rec {
 
   propagatedBuildInputs = [ typing-extensions ];
 
-  checkPhase = ''
-    ${python.interpreter} -m unittest
-  '';
-
   meta = with lib; {
     description = "Logging framework that organizes messages in a tree structure";
     homepage = "https://github.com/evalf/treelog";