diff --git a/overlays/nim-atlas/default.nix b/overlays/nim-atlas/default.nix
index d31665c..76a256f 100644
--- a/overlays/nim-atlas/default.nix
+++ b/overlays/nim-atlas/default.nix
@@ -1,7 +1,7 @@
-{...}: (_final: prev: {
+{...}: (final: prev: {
   nim-atlas = prev.nim-atlas.overrideNimAttrs {
     version = "unstable";
-    src = prev.fetchFromGitHub {
+    src = final.fetchFromGitHub {
       owner = "nim-lang";
       repo = "atlas";
       rev = "cbba9fa77fa837931bf3c58e20c1f8cb15a22919";
diff --git a/overlays/nimble/default.nix b/overlays/nimble/default.nix
index df07697..6b74dc4 100644
--- a/overlays/nimble/default.nix
+++ b/overlays/nimble/default.nix
@@ -1,10 +1,10 @@
-{...}: (_final: prev: {
+{...}: (final: prev: {
   nimble = prev.nimble.overrideNimAttrs {
     version = "0.14.2-f74bf2";
     requiredNimVersion = 2;
     buildInputs = [prev.pkgs.openssl];
 
-    src = prev.fetchFromGitHub {
+    src = final.fetchFromGitHub {
       owner = "nim-lang";
       repo = "nimble";
       # more recent commit