diff --git a/tests/functional/pyocf/types/cache.py b/tests/functional/pyocf/types/cache.py
index 139727f..a1bef30 100644
--- a/tests/functional/pyocf/types/cache.py
+++ b/tests/functional/pyocf/types/cache.py
@@ -205,7 +205,7 @@ class Cache:
 
     def start_cache(self, default_io_queue: Queue = None, mngt_queue: Queue = None):
         status = self.owner.lib.ocf_mngt_cache_start(
-            self.owner.ctx_handle, byref(self.cache_handle), byref(self.cfg)
+            self.owner.ctx_handle, byref(self.cache_handle), byref(self.cfg), None
         )
         if status:
             raise OcfError("Creating cache instance failed", status)
diff --git a/tests/functional/tests/management/test_start_stop.py b/tests/functional/tests/management/test_start_stop.py
index 92fb02e..42149a8 100644
--- a/tests/functional/tests/management/test_start_stop.py
+++ b/tests/functional/tests/management/test_start_stop.py
@@ -394,7 +394,7 @@ def test_start_stop_noqueue(pyocf_ctx):
 
     cache_handle = c_void_p()
     status = pyocf_ctx.lib.ocf_mngt_cache_start(
-        pyocf_ctx.ctx_handle, byref(cache_handle), byref(_cache.cfg)
+        pyocf_ctx.ctx_handle, byref(cache_handle), byref(_cache.cfg), None
     )
     assert not status, "Failed to start cache: {}".format(status)