diff --git a/pkgs/by-name/im/immersed/package.nix b/pkgs/by-name/im/immersed/package.nix
index 38ed8ab5fd60..dd97389eea7d 100644
--- a/pkgs/by-name/im/immersed/package.nix
+++ b/pkgs/by-name/im/immersed/package.nix
@@ -9,7 +9,7 @@ let
   pname = "immersed";
   version = "11.0.0";
 
-  sources = lib.mapAttrs (_: fetchurl) rec {
+  sources = lib.mapAttrs (_: fetchurl) {
     x86_64-linux = {
       url = "https://web.archive.org/web/20260306043741/https://static.immersed.com/dl/Immersed-x86_64.AppImage";
       hash = "sha256-GbckZ/WK+7/PFQvTfUwwePtufPKVwIwSPh+Bo/cG7ko=";
@@ -18,11 +18,10 @@ let
       url = "https://web.archive.org/web/20260306043741/https://static.immersed.com/dl/Immersed-aarch64.AppImage";
       hash = "sha256-3BokV30y6QRjE94K7JQ6iIuQw1t+h3BKZY+nEFGTVHI=";
     };
-    x86_64-darwin = {
+    aarch64-darwin = {
       url = "https://web.archive.org/web/20260306043741/https://static.immersed.com/dl/Immersed.dmg";
       hash = "sha256-L5nrkchXD1NIQCknYHVhBWbVJVkkHvKaDjuk9qiY340=";
     };
-    aarch64-darwin = x86_64-darwin;
   };
 
   src = sources.${stdenv.system} or (throw "Unsupported system: ${stdenv.system}");