diff --git a/sorting/quick_sort_3.cpp b/sorting/quick_sort_3.cpp
index b365144a1..72dc44d9b 100644
--- a/sorting/quick_sort_3.cpp
+++ b/sorting/quick_sort_3.cpp
@@ -146,7 +146,7 @@ static void test_int() {
         }
 
         std::cout << "Test " << num_tests << "\t Array size:" << size << "\t ";
-        std::vector<int> sorted = sorting::quicksort(arr, 0, size - 1);
+        std::vector<int> sorted = sorting::quicksort(arr, 0, int32_t(size) - 1);
         if (size < 20) {
             std::cout << "\t Sorted Array is:\n\t";
             std::cout << sorted << "\n";
@@ -169,7 +169,8 @@ static void test_double() {
         }
 
         std::cout << "Test " << num_tests << "\t Array size:" << size << "\t ";
-        std::vector<double> sorted = sorting::quicksort(arr, 0, size - 1);
+        std::vector<double> sorted =
+            sorting::quicksort(arr, 0, int32_t(size) - 1);
         if (size < 20) {
             std::cout << "\t Sorted Array is:\n\t";
             std::cout << sorted << "\n";