diff --git a/pkgs/development/python-modules/ftfy/default.nix b/pkgs/development/python-modules/ftfy/default.nix
index 0f6295323c05..883459222443 100644
--- a/pkgs/development/python-modules/ftfy/default.nix
+++ b/pkgs/development/python-modules/ftfy/default.nix
@@ -41,6 +41,11 @@ buildPythonPackage rec {
     export PATH=$out/bin:$PATH
   '';
 
+  disabledTests = [
+    # https://github.com/rspeer/python-ftfy/issues/226
+    "ftfy.formatting.monospaced_width"
+  ];
+
   meta = {
     changelog = "https://github.com/rspeer/python-ftfy/blob/${src.rev}/CHANGELOG.md";
     description = "Given Unicode text, make its representation consistent and possibly less broken";