diff --git a/src/core/benchmark/ranges.cc b/src/core/benchmark/ranges.cc
index 689d509..1494f4e 100644
--- a/src/core/benchmark/ranges.cc
+++ b/src/core/benchmark/ranges.cc
@@ -14,7 +14,7 @@ using klotski::cases::ALL_CASES_NUM;
 using klotski::cases::ALL_CASES_NUM_;
 using klotski::cases::BASIC_RANGES_NUM_;
 
-Ranges ranges_samples(const size_t num) {
+static Ranges ranges_samples(const size_t num) {
     auto &ranges = BasicRanges::instance().fetch();
     const size_t part_size = ranges.size() / num;
     const size_t offset = part_size / 2;
@@ -27,7 +27,7 @@ Ranges ranges_samples(const size_t num) {
     return result;
 }
 
-std::vector<size_t> all_cases_index_samples(const size_t num) {
+static std::vector<size_t> all_cases_index_samples(const size_t num) {
     const size_t part_size = ALL_CASES_NUM_ / num;
     const size_t offset = part_size / 2;
 
@@ -39,14 +39,14 @@ std::vector<size_t> all_cases_index_samples(const size_t num) {
     return result;
 }
 
-static void RangesReverse(benchmark::State &state) {
+static void BM_RangesReverse(benchmark::State &state) {
     auto ranges = BasicRanges::instance().fetch();
     for (auto _ : state) {
         ranges.reverse();
     }
 }
 
-static void RangesCheck(benchmark::State &state) {
+static void BM_RangesCheck(benchmark::State &state) {
     auto ranges = ranges_samples(state.range(0));
     ranges.reverse();
     for (auto _ : state) {
@@ -59,7 +59,7 @@ static void RangesCheck(benchmark::State &state) {
     state.SetItemsProcessed(state.iterations() * state.range(0) * 12);
 }
 
-static void RangesSpawn(benchmark::State &state) {
+static void BM_RangesSpawn(benchmark::State &state) {
     for (auto _ : state) {
         Ranges ranges {};
         ranges.reserve(BASIC_RANGES_NUM_);
@@ -69,7 +69,7 @@ static void RangesSpawn(benchmark::State &state) {
     }
 }
 
-static void RangesDerive(benchmark::State &state) {
+static void BM_RangesDerive(benchmark::State &state) {
     auto ranges = BasicRanges::instance().fetch();
     ranges.reverse();
     for (auto _ : state) {
@@ -81,7 +81,7 @@ static void RangesDerive(benchmark::State &state) {
     }
 }
 
-static void RangesUnionAt(benchmark::State &state) {
+static void BM_RangesUnionAt(benchmark::State &state) {
     const auto &all_cases = AllCases::instance().fetch();
     const auto samples = all_cases_index_samples(state.range(0));
     for (auto _ : state) {
@@ -92,7 +92,7 @@ static void RangesUnionAt(benchmark::State &state) {
     state.SetItemsProcessed(state.iterations() * state.range(0));
 }
 
-static void RangesUnionSize(benchmark::State &state) {
+static void BM_RangesUnionSize(benchmark::State &state) {
     auto &all_cases = AllCases::instance().fetch();
     for (auto _ : state) {
         for (int i = 0; i < state.range(0); ++i) {
@@ -102,7 +102,7 @@ static void RangesUnionSize(benchmark::State &state) {
     state.SetItemsProcessed(state.iterations() * state.range(0));
 }
 
-static void RangesUnionExport(benchmark::State &state) {
+static void BM_RangesUnionExport(benchmark::State &state) {
     auto &all_cases = AllCases::instance().fetch();
     for (auto _ : state) {
         auto codes = all_cases.codes();
@@ -110,14 +110,14 @@ static void RangesUnionExport(benchmark::State &state) {
     }
 }
 
-BENCHMARK(RangesReverse)->Unit(benchmark::kMillisecond);
-BENCHMARK(RangesCheck)->Unit(benchmark::kMicrosecond)->Range(16, 256);
+BENCHMARK(BM_RangesReverse)->Unit(benchmark::kMillisecond);
+BENCHMARK(BM_RangesCheck)->Unit(benchmark::kMicrosecond)->Range(16, 256);
 
-BENCHMARK(RangesSpawn)->Unit(benchmark::kMillisecond);
-BENCHMARK(RangesDerive)->Unit(benchmark::kMillisecond);
+BENCHMARK(BM_RangesSpawn)->Unit(benchmark::kMillisecond);
+BENCHMARK(BM_RangesDerive)->Unit(benchmark::kMillisecond);
 
-BENCHMARK(RangesUnionAt)->Range(16, 256);
-BENCHMARK(RangesUnionSize)->Range(16, 256);
-BENCHMARK(RangesUnionExport)->Unit(benchmark::kMillisecond);
+BENCHMARK(BM_RangesUnionAt)->Range(16, 256);
+BENCHMARK(BM_RangesUnionSize)->Range(16, 256);
+BENCHMARK(BM_RangesUnionExport)->Unit(benchmark::kMillisecond);
 
 BENCHMARK_MAIN();