diff --git a/pkgs/development/python-modules/cytoolz/default.nix b/pkgs/development/python-modules/cytoolz/default.nix
index ce24c505b83b..fafc31d65882 100644
--- a/pkgs/development/python-modules/cytoolz/default.nix
+++ b/pkgs/development/python-modules/cytoolz/default.nix
@@ -32,10 +32,10 @@ buildPythonPackage rec {
 
   nativeCheckInputs = [ pytestCheckHook ];
 
-  meta = {
+  meta = with lib; {
     homepage = "https://github.com/pytoolz/cytoolz/";
     description = "Cython implementation of Toolz: High performance functional utilities";
-    license = "licenses.bsd3";
+    license = licenses.bsd3;
     maintainers = with lib.maintainers; [ fridh ];
   };
 }
diff --git a/pkgs/development/python-modules/pillow-simd/default.nix b/pkgs/development/python-modules/pillow-simd/default.nix
index ca0d947d37b1..55842f20019d 100644
--- a/pkgs/development/python-modules/pillow-simd/default.nix
+++ b/pkgs/development/python-modules/pillow-simd/default.nix
@@ -31,7 +31,7 @@ import ../pillow/generic.nix (rec {
 
       Currently, Pillow-SIMD can be compiled with SSE4 (default) or AVX2 support.
     '';
-    license = "http://www.pythonware.com/products/pil/license.htm";
+    license = licenses.hpnd;
     maintainers = with maintainers; [ ];
   };
 } // args )
diff --git a/pkgs/development/python-modules/pycollada/default.nix b/pkgs/development/python-modules/pycollada/default.nix
index 06daa9194610..24f4d26fe02d 100644
--- a/pkgs/development/python-modules/pycollada/default.nix
+++ b/pkgs/development/python-modules/pycollada/default.nix
@@ -18,7 +18,7 @@ buildPythonPackage rec {
   meta = with lib; {
     description = "Python library for reading and writing collada documents";
     homepage = "http://pycollada.github.io/";
-    license = "BSD"; # they don't specify which BSD variant
+    license = licenses.bsd3;
     platforms = with platforms; linux ++ darwin;
     maintainers = with maintainers; [ bjornfor ];
   };
diff --git a/pkgs/development/python-modules/pyopengl/default.nix b/pkgs/development/python-modules/pyopengl/default.nix
index 318f2aa033b6..428bd4084ae0 100644
--- a/pkgs/development/python-modules/pyopengl/default.nix
+++ b/pkgs/development/python-modules/pyopengl/default.nix
@@ -69,7 +69,7 @@ buildPythonPackage rec {
       Python 2.5) ctypes library, and is provided under an extremely
       liberal BSD-style Open-Source license.
     '';
-    license = "BSD-style";
+    license = licenses.bsd3;
     platforms = platforms.mesaPlatforms;
   };