diff --git a/tests/functional/pyocf/types/cache.py b/tests/functional/pyocf/types/cache.py
index ab32f33..2d15a09 100644
--- a/tests/functional/pyocf/types/cache.py
+++ b/tests/functional/pyocf/types/cache.py
@@ -759,10 +759,16 @@ class Cache:
         self.cores.remove(core)
 
     def get_front_volume(self):
-        return Volume.get_instance(lib.ocf_cache_get_front_volume(self.cache_handle))
+        return Volume.get_instance(self.get_c_front_volume())
+
+    def get_c_front_volume(self):
+        return lib.ocf_cache_get_front_volume(self.cache_handle)
 
     def get_volume(self):
-        return Volume.get_instance(lib.ocf_cache_get_volume(self.cache_handle))
+        return Volume.get_instance(self.get_c_volume())
+
+    def get_c_volume(self):
+        return lib.ocf_cache_get_volume(self.cache_handle)
 
     def get_conf(self):
         cache_info = CacheInfo()
diff --git a/tests/functional/pyocf/types/core.py b/tests/functional/pyocf/types/core.py
index 7f5c93b..0ea11e4 100644
--- a/tests/functional/pyocf/types/core.py
+++ b/tests/functional/pyocf/types/core.py
@@ -97,10 +97,16 @@ class Core:
         return self.handle
 
     def get_front_volume(self):
-        return Volume.get_instance(lib.ocf_core_get_front_volume(self.handle))
+        return Volume.get_instance(self.get_c_front_volume())
+
+    def get_c_front_volume(self):
+        return lib.ocf_core_get_front_volume(self.handle)
 
     def get_volume(self):
-        return Volume.get_instance(lib.ocf_core_get_volume(self.handle))
+        return Volume.get_instance(self.get_c_volume())
+
+    def get_c_volume(self):
+        return lib.ocf_core_get_volume(self.handle)
 
     def get_default_queue(self):
         return self.cache.get_default_queue()