diff --git a/experiments/block_choice.cpp b/experiments/block_choice.cpp
index 4576979..73c8abc 100644
--- a/experiments/block_choice.cpp
+++ b/experiments/block_choice.cpp
@@ -152,7 +152,7 @@ void post_available_blocks(sm::block* calc_block, PIVector<sm::block*>& new_avai
 
 sm::time_report algorithm_runnable(std::atomic_flag& block_pool_flag,
 								   PIVector<sm::block*>& block_pool,
-								   std::atomic_int& waiting_threads_flags,
+								   std::atomic_uint& waiting_threads_flags,
 								   unsigned i, unsigned thread_count) {
 	bool is_block_pool_empty;
 	bool is_block_pool_empty_old;
@@ -167,7 +167,7 @@ sm::time_report algorithm_runnable(std::atomic_flag& block_pool_flag,
 		new_available_blocks.clear();
 
 		if (is_block_pool_empty) {
-			int waiting_threads_val;
+			unsigned waiting_threads_val;
 			if (is_block_pool_empty_old) {
 				waiting_threads_val = waiting_threads_flags.load(std::memory_order_acquire);
 			} else {
@@ -202,7 +202,7 @@ sm::time_report algorithm_runnable(std::atomic_flag& block_pool_flag,
 }
 
 std::vector<std::future<sm::time_report>> check_performance(const PIVector<sm::block*>& start_blocks, const unsigned thread_count) {
-	std::atomic_int waiting_threads_flags(0);
+	std::atomic_uint waiting_threads_flags(0);
 	std::atomic_flag block_pool_flag = ATOMIC_FLAG_INIT;
 	PIVector<sm::block*> block_pool = start_blocks;