diff --git a/pkgs/servers/home-assistant/appdaemon.nix b/pkgs/servers/home-assistant/appdaemon.nix
index 5f8884cbd3b7..5d4d88e1cda8 100644
--- a/pkgs/servers/home-assistant/appdaemon.nix
+++ b/pkgs/servers/home-assistant/appdaemon.nix
@@ -58,6 +58,10 @@ in python.pkgs.buildPythonApplication rec {
   # no tests implemented
   doCheck = false;
 
+  postPatch = ''
+    substituteInPlace setup.py --replace "pyyaml==5.1" "pyyaml"
+  '';
+
   meta = with lib; {
     description = "Sandboxed python execution environment for writing automation apps for Home Assistant";
     homepage = https://github.com/home-assistant/appdaemon;