diff --git a/pkgs/applications/misc/inkcut/default.nix b/pkgs/applications/misc/inkcut/default.nix
index b8833a8e4b1c..ce415b85ce79 100644
--- a/pkgs/applications/misc/inkcut/default.nix
+++ b/pkgs/applications/misc/inkcut/default.nix
@@ -1,14 +1,12 @@
 { lib
 , fetchpatch
-, python3Packages
+, python3
 , fetchFromGitHub
 , wrapQtAppsHook
 , cups
 }:
 
-with python3Packages;
-
-buildPythonApplication rec {
+python3.pkgs.buildPythonApplication rec {
   pname = "inkcut";
   version = "2.1.5";
 
@@ -48,7 +46,7 @@ buildPythonApplication rec {
 
   nativeBuildInputs = [ wrapQtAppsHook ];
 
-  propagatedBuildInputs = [
+  propagatedBuildInputs = with python3.pkgs; [
     enamlx
     twisted
     lxml
diff --git a/pkgs/development/python-modules/enaml/default.nix b/pkgs/development/python-modules/enaml/default.nix
index e46361adb1e0..542c4907a1d4 100644
--- a/pkgs/development/python-modules/enaml/default.nix
+++ b/pkgs/development/python-modules/enaml/default.nix
@@ -11,7 +11,7 @@
 , setuptools
 , setuptools-scm
 , pythonOlder
-, sip_4
+, sip
 }:
 
 buildPythonPackage rec {
@@ -43,7 +43,7 @@ buildPythonPackage rec {
     pegen
     ply
     qtpy
-    sip_4
+    sip
   ];
 
   # qt bindings cannot be found during tests