diff --git a/nix-darwin/default.nix b/nix-darwin/default.nix
index 6006c1fc..f400c9ce 100644
--- a/nix-darwin/default.nix
+++ b/nix-darwin/default.nix
@@ -70,8 +70,11 @@ in
 
       sharedModules = mkOption {
         type = with types;
-          listOf (anything // {
+          # TODO: use types.raw once this PR is merged: https://github.com/NixOS/nixpkgs/pull/132448
+          listOf (mkOptionType {
+            name = "submodule";
             inherit (submodule { }) check;
+            merge = lib.options.mergeOneOption;
             description = "Home Manager modules";
           });
         default = [ ];
diff --git a/nixos/default.nix b/nixos/default.nix
index cca9d279..e971cdc8 100644
--- a/nixos/default.nix
+++ b/nixos/default.nix
@@ -81,8 +81,11 @@ in {
 
       sharedModules = mkOption {
         type = with types;
-          listOf (anything // {
+        # TODO: use types.raw once this PR is merged: https://github.com/NixOS/nixpkgs/pull/132448
+          listOf (mkOptionType {
+            name = "submodule";
             inherit (submodule { }) check;
+            merge = lib.options.mergeOneOption;
             description = "Home Manager modules";
           });
         default = [ ];