diff --git a/pkgs/applications/audio/csound/csound-qt/default.nix b/pkgs/applications/audio/csound/csound-qt/default.nix
index e48b45aec3e4..c2c9432eaeb0 100644
--- a/pkgs/applications/audio/csound/csound-qt/default.nix
+++ b/pkgs/applications/audio/csound/csound-qt/default.nix
@@ -1,5 +1,5 @@
 { lib, stdenv, csound, desktop-file-utils,
-  fetchFromGitHub, python, python-qt, qmake,
+  fetchFromGitHub, python3, python-qt, qmake,
   qtwebengine, qtxmlpatterns, rtmidi, wrapQtAppsHook }:
 
 stdenv.mkDerivation rec {
@@ -26,13 +26,13 @@ stdenv.mkDerivation rec {
                  "CSOUND_INCLUDE_DIR=${csound}/include/csound"
                  "CSOUND_LIBRARY_DIR=${csound}/lib"
                  "RTMIDI_DIR=${rtmidi.src}"
-                 "PYTHONQT_SRC_DIR=${python-qt}/include/PythonQt"
+                 "PYTHONQT_SRC_DIR=${python-qt.src}"
                  "PYTHONQT_LIB_DIR=${python-qt}/lib"
                  "LIBS+=-L${python-qt}/lib"
-                 "INCLUDEPATH+=${python-qt}/include/PythonQt"
-                 "INCLUDEPATH+=${python}/include/python${python.pythonVersion}"
                  "INSTALL_DIR=${placeholder "out"}"
                  "SHARE_DIR=${placeholder "out"}/share"
+                 "PYTHON_DIR=${python3}"
+                 "PYTHON_VERSION=3.${python3.sourceVersion.minor}"
                  ];
 
   meta = with lib; {
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index f9d2874e68e7..8b7405dad54e 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -30348,9 +30348,7 @@ with pkgs;
 
   csound-manual = callPackage ../applications/audio/csound/csound-manual { };
 
-  csound-qt = libsForQt5.callPackage ../applications/audio/csound/csound-qt {
-    python = python3;
-  };
+  csound-qt = libsForQt5.callPackage ../applications/audio/csound/csound-qt { };
 
   codeblocks = callPackage ../applications/editors/codeblocks { };
   codeblocksFull = codeblocks.override { contribPlugins = true; };