diff --git a/sorting/selection_sort_iterative.cpp b/sorting/selection_sort_iterative.cpp
index f1bd00a93..90caeed48 100644
--- a/sorting/selection_sort_iterative.cpp
+++ b/sorting/selection_sort_iterative.cpp
@@ -45,9 +45,9 @@ namespace sorting {
  *******************************************************************************/
 template <typename T>
 void selectionSort(std::vector<T> &arr, uint64_t len) {
-    for (auto it = 0; it < len; ++it) {
+    for (uint64_t it = 0; it < len; ++it) {
         int64_t min = it;  // set min value
-        for (auto it2 = it + 1; it2 < len + 1; ++it2) {
+        for (uint64_t it2 = it + 1; it2 < len + 1; ++it2) {
             if (arr[it2] < arr[min]) {  // check which element is smaller
                 min = it2;  // store index of smallest element to min
             }