diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 2ef6bdebe86..4702a2ad063 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -14,6 +14,11 @@
 
 with pkgs.lib;
 
+let
+  qt5 = pkgs.qt514;
+  libsForQt5 = pkgs.libsForQt514;
+in
+
 let
   packages = ( self:
 
@@ -3576,7 +3581,7 @@ in {
 
   maya = callPackage ../development/python-modules/maya { };
 
-  mayavi = pkgs.libsForQt5.callPackage ../development/python-modules/mayavi {
+  mayavi = libsForQt5.callPackage ../development/python-modules/mayavi {
     inherit buildPythonPackage isPy27 fetchPypi;
     inherit (self) pyface pygments numpy vtk traitsui envisage apptools pyqt5;
   };
@@ -4162,7 +4167,7 @@ in {
 
   ovh = callPackage ../development/python-modules/ovh { };
 
-  ovito = toPythonModule (pkgs.libsForQt5.callPackage ../development/python-modules/ovito { pythonPackages = self; });
+  ovito = toPythonModule (libsForQt5.callPackage ../development/python-modules/ovito { pythonPackages = self; });
 
   owslib = callPackage ../development/python-modules/owslib { };
 
@@ -4483,8 +4488,8 @@ in {
   pooch = callPackage ../development/python-modules/pooch { };
 
   poppler-qt5 = callPackage ../development/python-modules/poppler-qt5 {
-    inherit (pkgs.qt5) qtbase;
-    inherit (pkgs.libsForQt5) poppler;
+    inherit (qt5) qtbase;
+    inherit (libsForQt5) poppler;
     inherit (pkgs) pkgconfig;
   };
 
@@ -5187,7 +5192,7 @@ in {
 
   pyqt4 = callPackage ../development/python-modules/pyqt/4.x.nix { inherit (pkgs) pkgconfig; };
 
-  pyqt5 = pkgs.libsForQt514.callPackage ../development/python-modules/pyqt/5.x.nix { pythonPackages = self; };
+  pyqt5 = libsForQt5.callPackage ../development/python-modules/pyqt/5.x.nix { pythonPackages = self; };
 
   pyqt5_with_qtmultimedia = self.pyqt5.override { withMultimedia = true; };
 
@@ -5200,7 +5205,7 @@ in {
 
   pyqtgraph = callPackage ../development/python-modules/pyqtgraph { };
 
-  pyqtwebengine = pkgs.libsForQt514.callPackage ../development/python-modules/pyqtwebengine { pythonPackages = self; };
+  pyqtwebengine = libsForQt5.callPackage ../development/python-modules/pyqtwebengine { pythonPackages = self; };
 
   pyquery = callPackage ../development/python-modules/pyquery { };
 
@@ -5901,7 +5906,7 @@ in {
 
   qscintilla-qt4 = callPackage ../development/python-modules/qscintilla { };
 
-  qscintilla-qt5 = pkgs.libsForQt5.callPackage ../development/python-modules/qscintilla-qt5 { pythonPackages = self; };
+  qscintilla-qt5 = libsForQt5.callPackage ../development/python-modules/qscintilla-qt5 { pythonPackages = self; };
 
   qscintilla = self.qscintilla-qt4;