diff --git a/pkgs/development/python-modules/buildout/default.nix b/pkgs/development/python-modules/buildout/default.nix
index 0b20eea257f..3cf2c1712fb 100644
--- a/pkgs/development/python-modules/buildout/default.nix
+++ b/pkgs/development/python-modules/buildout/default.nix
@@ -7,7 +7,7 @@
 }:
 
 buildPythonPackage rec {
-  pname = "zc_buildout";
+  pname = "zc-buildout";
   version = "3.0.0b2";
 
   src = fetchFromGitHub {
diff --git a/pkgs/development/python-modules/z3c-checkversions/default.nix b/pkgs/development/python-modules/z3c-checkversions/default.nix
index 8610306ea6f..b8c684295a6 100644
--- a/pkgs/development/python-modules/z3c-checkversions/default.nix
+++ b/pkgs/development/python-modules/z3c-checkversions/default.nix
@@ -2,7 +2,7 @@
 , buildPythonPackage
 , fetchPypi
 , python
-, zc_buildout
+, zc-buildout
 , zope_testrunner
 }:
 
@@ -16,7 +16,7 @@ buildPythonPackage rec {
     sha256 = "b45bd22ae01ed60933694fb5abede1ff71fe8ffa79b37082b2fcf38a2f0dec9d";
   };
 
-  propagatedBuildInputs = [ zc_buildout ];
+  propagatedBuildInputs = [ zc-buildout ];
   checkInputs = [ zope_testrunner ];
   doCheck = !python.pkgs.isPy27;
   checkPhase = ''
diff --git a/pkgs/top-level/python-aliases.nix b/pkgs/top-level/python-aliases.nix
index 9e24ea29e7f..bd3e315f086 100644
--- a/pkgs/top-level/python-aliases.nix
+++ b/pkgs/top-level/python-aliases.nix
@@ -84,5 +84,5 @@ mapAliases ({
   tvnamer = throw "python3Packages.tvnamer was moved to tvnamer"; # 2021-07-05
   WazeRouteCalculator = wazeroutecalculator; # 2021-09-29
   websocket_client = websocket-client;
-  zc_buildout221 = zc_buildout; # added 2021-07-21
+  zc-buildout221 = zc-buildout; # added 2021-07-21
 })
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index c5f8b2f32de..ccffb1fe5da 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -10011,7 +10011,7 @@ in {
 
   zarr = callPackage ../development/python-modules/zarr { };
 
-  zc_buildout = callPackage ../development/python-modules/buildout { };
+  zc-buildout = callPackage ../development/python-modules/buildout { };
 
   zc_buildout_nix = callPackage ../development/python-modules/buildout-nix { };