diff --git a/pkgs/development/python-modules/flask-babel/default.nix b/pkgs/development/python-modules/flask-babel/default.nix
index 0222ea21c983..c573521bc970 100644
--- a/pkgs/development/python-modules/flask-babel/default.nix
+++ b/pkgs/development/python-modules/flask-babel/default.nix
@@ -1,6 +1,7 @@
 { lib
 , buildPythonPackage
 , fetchFromGitHub
+, fetchpatch
 
 # build-system
 , poetry-core
@@ -32,6 +33,14 @@ buildPythonPackage rec {
     hash = "sha256-bHsB1f7dbZW4k8JteyZOwVCgWRDZMu21XdMcjM5NYjk=";
   };
 
+  patches = [
+    (fetchpatch {
+      # https://github.com/python-babel/flask-babel/pull/222
+      url = "https://github.com/python-babel/flask-babel/commit/756cace7d96e9eacef66813c8df653d2bb349da0.patch";
+      hash = "sha256-hp/QPS/ZyRMUnyqU+fvMJKPISBECc9kqdCu8U6Hnd5g=";
+    })
+  ];
+
   outputs = [
     "out"
     "doc"