diff --git a/pkgs/development/python-modules/pyfronius/default.nix b/pkgs/development/python-modules/pyfronius/default.nix
index b78aeb19545e..8a27fb0bae9c 100644
--- a/pkgs/development/python-modules/pyfronius/default.nix
+++ b/pkgs/development/python-modules/pyfronius/default.nix
@@ -2,6 +2,7 @@
 , aiohttp
 , buildPythonPackage
 , fetchFromGitHub
+, fetchpatch
 , pythonOlder
 , pytestCheckHook
 }:
@@ -19,6 +20,14 @@ buildPythonPackage rec {
     sha256 = "1xwx0c1dp2374bwigzwhvcj4577vrxyhn6i5zv73k9ydc7w1xgyz";
   };
 
+  patches = [
+    (fetchpatch {
+      # Python3.10 compatibility; https://github.com/nielstron/pyfronius/pull/7
+      url = "https://github.com/nielstron/pyfronius/commit/9deb209d4246ff575cd3c4c5373037bf11df6719.patch";
+      hash = "sha256-srXYCvp86kGYUYZIXMcu68hEbkTspD945J+hc/AhqSw=";
+    })
+  ];
+
   propagatedBuildInputs = [
     aiohttp
   ];