diff --git a/pkgs/development/python-modules/mitmproxy/default.nix b/pkgs/development/python-modules/mitmproxy/default.nix
index 31fc2db49508..9715ad66ac9f 100644
--- a/pkgs/development/python-modules/mitmproxy/default.nix
+++ b/pkgs/development/python-modules/mitmproxy/default.nix
@@ -50,6 +50,7 @@ buildPythonPackage rec {
   };
 
   pythonRelaxDeps = [
+    "urwid"
     "zstandard"
 
     # requested by maintainer