diff --git a/flake.nix b/flake.nix
index 5fa2d1d..2b53ebd 100644
--- a/flake.nix
+++ b/flake.nix
@@ -9,11 +9,11 @@
     nixpkgs,
     flake-utils,
   }: let
-    mapOverlayOverride = namespace: overlay: final: prev: let
+    mapOverlayOverride = prefix: overlay: final: prev: let
       overlayPkgs = overlay final prev;
     in
       {
-        "${namespace}" = builtins.removeAttrs overlayPkgs ["override"];
+        "${prefix}" = (prev.${prefix} or {}) // builtins.removeAttrs overlayPkgs ["override"];
       }
       // (overlayPkgs.override or {});
 
@@ -30,7 +30,7 @@
       packages =
         (import nixpkgs {
           inherit system;
-          overlays = [(mapOverlayOverride doctrineNoPkgs.prefix (import ./pkgs))];
+          overlays = [self.overlays.default];
         }).${
           doctrineNoPkgs.prefix
         };
@@ -121,7 +121,7 @@
                     }
                     # NB: Preserve the relative order
                     {
-                      overlay = self.overlays.default;
+                      overlay = mapOverlayOverride prefix (import ./pkgs);
                       condition = true;
                     }
                     {