diff --git a/pkgs/development/interpreters/python/passthrufun.nix b/pkgs/development/interpreters/python/passthrufun.nix
index 867027e3841c..6cb906be0a51 100644
--- a/pkgs/development/interpreters/python/passthrufun.nix
+++ b/pkgs/development/interpreters/python/passthrufun.nix
@@ -67,6 +67,8 @@
       overrides = packageOverrides;
       python = self;
     });
+  pythonOnBuildForHost_overridden =
+    pythonOnBuildForHost.override { inherit packageOverrides; self = pythonOnBuildForHost_overridden; };
 in rec {
     isPy27 = pythonVersion == "2.7";
     isPy37 = pythonVersion == "3.7";
@@ -89,9 +91,10 @@ in rec {
     pythonAtLeast = lib.versionAtLeast pythonVersion;
     pythonOlder = lib.versionOlder pythonVersion;
     inherit hasDistutilsCxxPatch;
-    # TODO: rename to pythonOnBuild
+    # TODO: deprecate
     # Not done immediately because its likely used outside Nixpkgs.
-    pythonForBuild = pythonOnBuildForHost.override { inherit packageOverrides; self = pythonForBuild; };
+    pythonForBuild = pythonOnBuildForHost_overridden;
+    pythonOnBuildForHost = pythonOnBuildForHost_overridden;
 
     tests = callPackage ./tests.nix {
       python = self;
diff --git a/pkgs/development/python-modules/pyqtwebengine/default.nix b/pkgs/development/python-modules/pyqtwebengine/default.nix
index 71abe839a789..9dc076a5e8d1 100644
--- a/pkgs/development/python-modules/pyqtwebengine/default.nix
+++ b/pkgs/development/python-modules/pyqtwebengine/default.nix
@@ -33,7 +33,7 @@ in buildPythonPackage (rec {
   ] ++ lib.optionals (stdenv.buildPlatform == stdenv.hostPlatform) [
     sip
   ] ++ lib.optionals (stdenv.buildPlatform != stdenv.hostPlatform) [
-    buildPackages.python3Packages.sip
+    python.pythonOnBuildForHost.pkgs.sip
   ] ++ [
     qtbase
     qtsvg