diff --git a/robot.h b/robot.h
index c540dc2..facf5af 100644
--- a/robot.h
+++ b/robot.h
@@ -2,11 +2,10 @@
 #define ROBOT_HEADER
 
 #include <string>
-using string = std::string;
 
 class robot {
 private:
-  const string _name;
+  const std::string _name;
   int _north;
   int _east;
   int _steps;
@@ -15,9 +14,9 @@ public:
   void move_east();
   void move_south();
   void move_west();
-  int north();
-  int east();
-  int travelled();
+  int const north();
+  int const east();
+  int const travelled();
 }
 
 #endif