diff --git a/pkgs/development/interpreters/python/mk-python-derivation.nix b/pkgs/development/interpreters/python/mk-python-derivation.nix
index e634df7a1e96..eb8e76101c49 100644
--- a/pkgs/development/interpreters/python/mk-python-derivation.nix
+++ b/pkgs/development/interpreters/python/mk-python-derivation.nix
@@ -377,8 +377,8 @@ let
       # Python packages don't have a checkPhase, only an installCheckPhase
       doCheck = false;
       doInstallCheck = attrs.doCheck or true;
-      nativeInstallCheckInputs = nativeCheckInputs;
-      installCheckInputs = checkInputs;
+      nativeInstallCheckInputs = nativeCheckInputs ++ attrs.nativeInstallCheckInputs or [ ];
+      installCheckInputs = checkInputs ++ attrs.installCheckInputs or [ ];
 
       inherit dontWrapPythonPrograms;