diff --git a/pkgs/development/python-modules/pyqt/4.x.nix b/pkgs/development/python-modules/pyqt/4.x.nix
index 92b74c952fac..31294c8dc98d 100644
--- a/pkgs/development/python-modules/pyqt/4.x.nix
+++ b/pkgs/development/python-modules/pyqt/4.x.nix
@@ -3,7 +3,7 @@
 let version = "4.11.3";
 in
 stdenv.mkDerivation {
-  name = "PyQt-x11-gpl-${version}";
+  name = "${python.libPrefix}-PyQt-x11-gpl-${version}";
 
   src = fetchurl {
     url = "mirror://sourceforge/pyqt/PyQt4/PyQt-${version}/PyQt-x11-gpl-${version}.tar.gz";
diff --git a/pkgs/development/python-modules/pyqt/5.x.nix b/pkgs/development/python-modules/pyqt/5.x.nix
index b89052602d9a..bb1d91b3ca83 100644
--- a/pkgs/development/python-modules/pyqt/5.x.nix
+++ b/pkgs/development/python-modules/pyqt/5.x.nix
@@ -3,7 +3,7 @@
 let
   version = "5.4.2";
 in stdenv.mkDerivation {
-  name = "PyQt-${version}";
+  name = "${python.libPrefix}-PyQt-${version}";
 
   meta = with stdenv.lib; {
     description = "Python bindings for Qt5";