diff --git a/backtracking/subset_sum.cpp b/backtracking/subset_sum.cpp
index 5f0a2ada1..63fced370 100644
--- a/backtracking/subset_sum.cpp
+++ b/backtracking/subset_sum.cpp
@@ -82,7 +82,7 @@ static void test() {
 
     // Test 4
     std::cout << "4th test ";
-    std::vector<int> array4 = {3, 3, 3, 3};
+    std::vector<uint64_t> array4 = {3, 3, 3, 3};
     assert(backtracking::subset_sum::subset_sum(6, array4) ==
            6);  // here we are expecting 6 subsets which sum up to 6 i.e.
                 // {(3,3),(3,3),(3,3),(3,3),(3,3),(3,3)}