diff --git a/tests/functional/pyocf/types/io.py b/tests/functional/pyocf/types/io.py
index 3ea35b8..8a3daa8 100644
--- a/tests/functional/pyocf/types/io.py
+++ b/tests/functional/pyocf/types/io.py
@@ -43,10 +43,10 @@ class Io(Structure):
         ("_dir", c_uint32),
         ("_io_queue", c_void_p),
         ("_start", START),
-        ("_handle", HANDLE),
-        ("_end", END),
         ("_priv1", c_void_p),
         ("_priv2", c_void_p),
+        ("_handle", HANDLE),
+        ("_end", END),
     ]
 
     @classmethod
diff --git a/tests/functional/pyocf/types/ioclass.py b/tests/functional/pyocf/types/ioclass.py
index e5bafdb..908f281 100644
--- a/tests/functional/pyocf/types/ioclass.py
+++ b/tests/functional/pyocf/types/ioclass.py
@@ -23,10 +23,10 @@ class IoClassInfo(Structure):
 class IoClassConfig(Structure):
     _fields_ = [
         ("_class_id", c_uint32),
-        ("_name", c_char_p),
-        ("_prio", c_uint16),
-        ("_cache_mode", c_int),
         ("_max_size", c_uint32),
+        ("_name", c_char_p),
+        ("_cache_mode", c_int),
+        ("_prio", c_uint16),
     ]
 
 
diff --git a/tests/functional/pyocf/types/stats/cache.py b/tests/functional/pyocf/types/stats/cache.py
index d4ef4ff..521416d 100644
--- a/tests/functional/pyocf/types/stats/cache.py
+++ b/tests/functional/pyocf/types/stats/cache.py
@@ -19,6 +19,7 @@ class CacheInfo(Structure):
     _fields_ = [
         ("attached", c_bool),
         ("volume_type", c_uint8),
+        ("state", c_uint8),
         ("size", c_uint32),
         ("inactive", _Inactive),
         ("occupancy", c_uint32),
@@ -27,7 +28,6 @@ class CacheInfo(Structure):
         ("dirty_for", c_uint64),
         ("cache_mode", c_uint32),
         ("fallback_pt", _FallbackPt),
-        ("state", c_uint8),
         ("eviction_policy", c_uint32),
         ("cleaning_policy", c_uint32),
         ("promotion_policy", c_uint32),
diff --git a/tests/functional/pyocf/types/volume.py b/tests/functional/pyocf/types/volume.py
index ae682a5..29bf090 100644
--- a/tests/functional/pyocf/types/volume.py
+++ b/tests/functional/pyocf/types/volume.py
@@ -53,8 +53,8 @@ class VolumeOps(Structure):
         ("_submit_write_zeroes", SUBMIT_WRITE_ZEROES),
         ("_open", OPEN),
         ("_close", CLOSE),
-        ("_get_max_io_size", GET_MAX_IO_SIZE),
         ("_get_length", GET_LENGTH),
+        ("_get_max_io_size", GET_MAX_IO_SIZE),
     ]
 
 
@@ -64,9 +64,9 @@ class VolumeProperties(Structure):
         ("_io_priv_size", c_uint32),
         ("_volume_priv_size", c_uint32),
         ("_caps", VolumeCaps),
-        ("_ops", VolumeOps),
         ("_io_ops", IoOps),
         ("_deinit", c_char_p),
+        ("_ops", VolumeOps),
     ]