diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 566ee8540fe1..f570752b8cd0 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -39837,7 +39837,7 @@ with pkgs;
 
   diylc = callPackage ../applications/science/electronics/diylc { };
 
-  flatcam = python3.pkgs.callPackage ../applications/science/electronics/flatcam { };
+  flatcam = python39.pkgs.callPackage ../applications/science/electronics/flatcam { };
 
   flopoco = callPackage ../applications/science/electronics/flopoco { };