diff --git a/pkgs/development/python-modules/iowait/default.nix b/pkgs/development/python-modules/iowait/default.nix
index fe0a6a5f709a..d5be45de2e26 100644
--- a/pkgs/development/python-modules/iowait/default.nix
+++ b/pkgs/development/python-modules/iowait/default.nix
@@ -1,4 +1,8 @@
-{ buildPythonPackage, fetchPypi }:
+{
+  lib,
+  buildPythonPackage,
+  fetchPypi,
+}:
 
 buildPythonPackage rec {
   pname = "iowait";
@@ -13,5 +17,6 @@ buildPythonPackage rec {
   meta = {
     description = "Platform-independent module for I/O completion events";
     homepage = "https://launchpad.net/python-iowait";
+    license = lib.licenses.lgpl3Only;
   };
 }