diff --git a/tests/functional/pyocf/rio.py b/tests/functional/pyocf/rio.py
index 88c465a..fe8827a 100644
--- a/tests/functional/pyocf/rio.py
+++ b/tests/functional/pyocf/rio.py
@@ -125,7 +125,7 @@ class Rio:
 
         def run(self):
             iogen = IoGen(
-                (self.jobspec.offset, self.jobspec.size - self.jobspec.offset),
+                (self.jobspec.offset, self.jobspec.size),
                 self.jobspec.bs,
                 self.jobspec.randseed + hash(self.name),
                 self.jobspec.readwrite.is_random(),
@@ -136,11 +136,9 @@ class Rio:
                 self.finish_time = datetime.now() + self.jobspec.time
             else:
                 if int(self.jobspec.io_size) != 0:
-                    self.io_target = min(
-                        self.jobspec.io_size, self.jobspec.size - self.jobspec.offset
-                    )
+                    self.io_target = min(self.jobspec.io_size, self.jobspec.size)
                 else:
-                    self.io_target = self.jobspec.size - self.jobspec.offset
+                    self.io_target = self.jobspec.size
 
             # TODO randrw
             iodir = (
diff --git a/tests/functional/tests/engine/test_pp.py b/tests/functional/tests/engine/test_pp.py
index 99fc291..7c97834 100644
--- a/tests/functional/tests/engine/test_pp.py
+++ b/tests/functional/tests/engine/test_pp.py
@@ -1,5 +1,6 @@
 #
 # Copyright(c) 2019-2022 Intel Corporation
+# Copyright(c) 2024 Huawei Technologies
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
@@ -174,7 +175,7 @@ def test_promoted_after_hits_various_thresholds(pyocf_ctx, insertion_threshold,
         .bs(Size(4096))
         .offset(last_core_line)
         .target(vol)
-        .size(Size(4096) + last_core_line)
+        .size(Size(4096))
     )
 
     for i in range(insertion_threshold - 1):
diff --git a/tests/functional/tests/failover/test_standby_io.py b/tests/functional/tests/failover/test_standby_io.py
index 6519eda..66d55ab 100644
--- a/tests/functional/tests/failover/test_standby_io.py
+++ b/tests/functional/tests/failover/test_standby_io.py
@@ -1,5 +1,6 @@
 #
 # Copyright(c) 2022 Intel Corporation
+# Copyright(c) 2024 Huawei Technologies
 # SPDX-License-Identifier: BSD-3-Clause
 #
 
@@ -81,7 +82,7 @@ def test_test_standby_io_metadata(pyocf_ctx, cacheline_size):
         .target(cache_vol)
         .njobs(num_jobs)
         .readwrite(ReadWrite.RANDWRITE)
-        .size(io_offset + io_size)
+        .size(io_size)
         .bs(Size.from_KiB(16))
         .offset(io_offset)
         .qd(qd)