diff --git a/test/functional/tests/io_class/test_io_class_occupancy.py b/test/functional/tests/io_class/test_io_class_occupancy.py
index c782b69..6a9341a 100644
--- a/test/functional/tests/io_class/test_io_class_occupancy.py
+++ b/test/functional/tests/io_class/test_io_class_occupancy.py
@@ -11,7 +11,7 @@ import pytest
 from .io_class_common import *
 from api.cas.cache_config import CacheMode, CacheLineSize
 from api.cas.ioclass_config import IoClass
-from api.cas.statistics import UsageStats
+from api.cas.statistics import IoClassUsageStats
 from storage_devices.disk import DiskType, DiskTypeSet, DiskTypeLowerThan
 from test_tools import fs_utils
 from test_tools.disk_utils import Filesystem
@@ -337,7 +337,7 @@ def test_ioclass_occupancy_sum_cache():
         cache.purge_cache()
 
     with TestRun.step("Verify stats before IO"):
-        usage_stats_sum = UsageStats(Size(0), Size(0), Size(0), Size(0))
+        usage_stats_sum = IoClassUsageStats(Size(0), Size(0), Size(0))
         for i in io_classes:
             usage_stats_sum += get_io_class_usage(cache, i.id)
         usage_stats_sum += get_io_class_usage(cache, default_ioclass_id)
@@ -364,7 +364,7 @@ def test_ioclass_occupancy_sum_cache():
             )
 
     with TestRun.step("Verify stats after IO"):
-        usage_stats_sum = UsageStats(Size(0), Size(0), Size(0), Size(0))
+        usage_stats_sum = IoClassUsageStats(Size(0), Size(0), Size(0))
         for i in io_classes:
             usage_stats_sum += get_io_class_usage(cache, i.id)
         usage_stats_sum += get_io_class_usage(cache, default_ioclass_id)
diff --git a/test/functional/tests/io_class/test_io_class_purge.py b/test/functional/tests/io_class/test_io_class_purge.py
index 029aa3a..5316790 100644
--- a/test/functional/tests/io_class/test_io_class_purge.py
+++ b/test/functional/tests/io_class/test_io_class_purge.py
@@ -8,7 +8,7 @@ from collections import namedtuple
 import pytest
 
 from api.cas import ioclass_config, casadm
-from api.cas.statistics import UsageStats
+from api.cas.statistics import IoClassUsageStats
 from core.test_run import TestRun
 from storage_devices.disk import DiskType, DiskTypeSet, DiskTypeLowerThan
 from test_tools import fs_utils
@@ -108,7 +108,7 @@ def get_io_class_usage(cache, io_class_id):
 def verify_ioclass_usage_stats(cache, ioclasses_ids):
     cache_size = cache.get_statistics().config_stats.cache_size
 
-    usage_stats_sum = UsageStats(Size(0), Size(0), Size(0), Size(0))
+    usage_stats_sum = IoClassUsageStats(Size(0), Size(0), Size(0))
     for i in ioclasses_ids:
         usage_stats_sum += get_io_class_usage(cache, i)
 
diff --git a/test/functional/tests/stats/test_ioclass_stats.py b/test/functional/tests/stats/test_ioclass_stats.py
index ba38fea..613f3c7 100644
--- a/test/functional/tests/stats/test_ioclass_stats.py
+++ b/test/functional/tests/stats/test_ioclass_stats.py
@@ -16,7 +16,12 @@ from api.cas.cli_messages import (
     get_stats_ioclass_id_out_of_range
 )
 from api.cas.statistics import (
-    config_stats_ioclass, usage_stats, request_stats, block_stats_core, block_stats_cache
+    config_stats_ioclass,
+    usage_stats,
+    usage_stats_ioclass,
+    request_stats,
+    block_stats_core,
+    block_stats_cache
 )
 from core.test_run import TestRun
 from storage_devices.disk import DiskType, DiskTypeSet, DiskTypeLowerThan
@@ -147,7 +152,7 @@ def test_ioclass_stats_sum(random_cls):
 
     with TestRun.step("Check if per class cache IO class statistics sum up to cache statistics"):
         # Name of stats, which should not be compared
-        not_compare_stats = ["clean", "occupancy"]
+        not_compare_stats = ["clean", "occupancy", "free"]
         ioclass_id_list = list(range(min_ioclass_id, max_ioclass_id))
         # Append default IO class id
         ioclass_id_list.append(0)
@@ -275,7 +280,7 @@ def get_checked_statistics(stat_filter: StatsFilter, per_core: bool):
     if stat_filter == StatsFilter.conf:
         return config_stats_ioclass
     if stat_filter == StatsFilter.usage:
-        return usage_stats
+        return usage_stats_ioclass
     if stat_filter == StatsFilter.blk:
         return block_stats_core if per_core else block_stats_cache
     if stat_filter == StatsFilter.req: