diff --git a/nix/pyproject-overrides.nix b/nix/pyproject-overrides.nix
index 6aed55ca0219..cb6af7acf889 100644
--- a/nix/pyproject-overrides.nix
+++ b/nix/pyproject-overrides.nix
@@ -53,7 +53,7 @@ in
   });
 
   psygnal = prev.psygnal.overrideAttrs (_: {
-    format = null;
+    src = null;
   });
 }) // lib.mapAttrs (name: spec: addBuildSystems prev.${name} spec) buildSystemOverrides // {
   mysqlclient = prev.mysqlclient.overrideAttrs (attrs: {