diff --git a/pkgs/development/python-modules/funcparserlib/default.nix b/pkgs/development/python-modules/funcparserlib/default.nix
index 3ace04b108d4..ba535146cf25 100644
--- a/pkgs/development/python-modules/funcparserlib/default.nix
+++ b/pkgs/development/python-modules/funcparserlib/default.nix
@@ -6,6 +6,7 @@
 , python
 , pytestCheckHook
 , pythonOlder
+, six
 }:
 
 buildPythonPackage rec {
@@ -28,6 +29,7 @@ buildPythonPackage rec {
 
   checkInputs = [
     pytestCheckHook
+    six
   ];
 
   patches = [