diff --git a/pkgs/development/python-modules/psycopg/default.nix b/pkgs/development/python-modules/psycopg/default.nix
index 1b84cc6140c8..7dbc28594eb6 100644
--- a/pkgs/development/python-modules/psycopg/default.nix
+++ b/pkgs/development/python-modules/psycopg/default.nix
@@ -2,6 +2,7 @@
 , stdenv
 , buildPythonPackage
 , fetchFromGitHub
+, fetchpatch
 , fetchurl
 , pythonOlder
 , substituteAll
@@ -48,6 +49,11 @@ let
       libpq = "${postgresql.lib}/lib/libpq${stdenv.hostPlatform.extensions.sharedLibrary}";
       libc = "${stdenv.cc.libc}/lib/libc.so.6";
     })
+    (fetchpatch {
+      name = "cython-3.0.0b1-compat.patch";
+      url = "https://github.com/psycopg/psycopg/commit/573446a14312f36257ed9dcfb8eb2756b69d5d9b.patch";
+      hash = "sha256-NWItarNb/Yyfj1avb/SXTkinVGxvWUGH8y6tR/zhVmE=";
+    })
   ];
 
   baseMeta = {