diff --git a/src/haskell/testdata/Arion/NixSpec/arion-compose.json b/src/haskell/testdata/Arion/NixSpec/arion-compose.json
index 5f644ac..64b8169 100644
--- a/src/haskell/testdata/Arion/NixSpec/arion-compose.json
+++ b/src/haskell/testdata/Arion/NixSpec/arion-compose.json
@@ -33,6 +33,7 @@
         }
     },
     "version": "3.4",
+    "volumes": {},
     "x-arion": {
         "images": [
             {
diff --git a/src/nix/modules/composition/docker-compose.nix b/src/nix/modules/composition/docker-compose.nix
index 6555e6b..8ff3f62 100644
--- a/src/nix/modules/composition/docker-compose.nix
+++ b/src/nix/modules/composition/docker-compose.nix
@@ -64,7 +64,7 @@ in
       description = "An attribute set of service configurations. A service specifies how to run an image as a container.";
     };
     docker-compose.volumes = lib.mkOption {
-      type = lib.types.attrsOf (lib.types.submodule service.volumes);
+      type = lib.types.attrsOf lib.types.unspecified;
       description = "A attribute set of volume configurations.";
       default = {};
     };