diff --git a/machinesystem.capnp b/machinesystem.capnp
index 473fa53..0ea8cf8 100644
--- a/machinesystem.capnp
+++ b/machinesystem.capnp
@@ -9,9 +9,9 @@ $CSharp.namespace("FabAccessAPI.Schema");
 using General = import "general.capnp";
 using Machine = import "machine.capnp".Machine;
 
-interface MachineSystem 
+struct MachineSystem
 {
-	info @0 () -> ( info : Info );
+	info @0 :Info;
     interface Info $CSharp.name("InfoInterface") {
     	getMachineList @0 () -> ( machine_list :List(Machine) );
 
diff --git a/permissionsystem.capnp b/permissionsystem.capnp
index fbca4be..6ef60ff 100644
--- a/permissionsystem.capnp
+++ b/permissionsystem.capnp
@@ -8,14 +8,14 @@ $CSharp.namespace("FabAccessAPI.Schema");
 
 using Role = import "role.capnp".Role;
 
-interface PermissionSystem 
+struct PermissionSystem
 {
-    info @0 () -> ( info : Info );
+    info @0 :Info;
     interface Info $CSharp.name("InfoInterface") {
     	getRoleList @0 () -> ( role_list :List(Role) );
 	}
 
-	manage @1 () -> ( manage : Manage );
+	manage @1 :Manage;
     interface Manage $CSharp.name("ManageInterface") {
     	
 	}
diff --git a/usersystem.capnp b/usersystem.capnp
index 955514b..50cda33 100644
--- a/usersystem.capnp
+++ b/usersystem.capnp
@@ -9,18 +9,18 @@ $CSharp.namespace("FabAccessAPI.Schema");
 using General = import "general.capnp";
 using User = import "user.capnp".User;
 
-interface UserSystem 
+struct UserSystem
 {
-	info @0 () -> ( info : Info );
+	info @0 :Info;
     interface Info $CSharp.name("InfoInterface") {
-    	getUserSelf @0 ( ) -> ( user :User, dummy :UInt8 = 0 );
+    	getUserSelf @0 ( ) -> User;
 	}
 
-	manage @1 () -> ( manage : Manage );
+	manage @1 :Manage;
     interface Manage $CSharp.name("ManageInterface") {
     	getUserList @0 () -> ( user_list :List(User) );
 
-    	addUser @1 (username :Text, password: Text) -> ( user :User );
-    	removeUser @2 (user :User, dummy :UInt8 = 0);
+    	addUser @1 (username :Text, password: Text) -> User;
+    	removeUser @2 User;
 	}
-}
\ No newline at end of file
+}