diff --git a/modules/darwin/system/homebrew/default.nix b/modules/darwin/system/homebrew/default.nix
index 77f0d86..7752d06 100644
--- a/modules/darwin/system/homebrew/default.nix
+++ b/modules/darwin/system/homebrew/default.nix
@@ -39,5 +39,8 @@ in
       # With mutableTaps disabled, taps can no longer be added imperatively with `brew tap`.
       mutableTaps = false;
     };
+    programs.fish.shellInit = ''
+      /opt/homebrew/bin/brew shellenv | source
+    '';
   };
 }
diff --git a/systems/aarch64-darwin/m4/default.nix b/systems/aarch64-darwin/m4/default.nix
index a402f6f..1099a0c 100644
--- a/systems/aarch64-darwin/m4/default.nix
+++ b/systems/aarch64-darwin/m4/default.nix
@@ -9,7 +9,7 @@ with lib.metacfg;
       "libusb"
       "mas"
     ];
-    masApps = [ ];
+    masApps = { };
   };
 
   metacfg = {