diff --git a/dynamic_programming/house_robber.cpp b/dynamic_programming/house_robber.cpp
index 4e6dc90fc..b718cfa85 100644
--- a/dynamic_programming/house_robber.cpp
+++ b/dynamic_programming/house_robber.cpp
@@ -30,7 +30,7 @@ namespace house_robber {
  * @param n size of array
  * @returns maximum amount of money that can be robbed
  */
-std::uint64_t houseRobber(const std::vector<int> &money, int n) {
+std::uint64_t houseRobber(const std::vector<int> &money, const int &n) {
     if (n == 0) {  // if there is no house
         return 0;
     }