diff --git a/src/pandablocks_ioc/ioc.py b/src/pandablocks_ioc/ioc.py
index f65625a6..5bf47efb 100644
--- a/src/pandablocks_ioc/ioc.py
+++ b/src/pandablocks_ioc/ioc.py
@@ -309,6 +309,7 @@ class _RecordUpdater:
 
     Args:
         record_info: The RecordInfo structure for the record
+        record_prefix: The prefix of the record name
         client: The client used to send data to PandA
         all_values_dict: The dictionary containing the most recent value of all records
             as returned from GetChanges. This dict will be dynamically updated by other
@@ -317,6 +318,7 @@ class _RecordUpdater:
     """
 
     record_info: RecordInfo
+    record_prefix: str
     client: AsyncioClient
     all_values_dict: Dict[EpicsName, RecordValue]
     labels: Optional[List[str]]
@@ -344,7 +346,8 @@ async def update(self, new_val: Any):
                 # value is None - expected for action-write fields
                 val = new_val
 
-            panda_field = device_and_record_to_panda_name(self.record_info.record.name)
+            record_name = self.record_info.record.name.removeprefix(self.record_prefix)
+            panda_field = device_and_record_to_panda_name(record_name)
 
             await self.client.send(Put(panda_field, val))
 
@@ -360,7 +363,9 @@ async def update(self, new_val: Any):
             )
             try:
                 if self.record_info.record:
-                    record_name = self.record_info.record.name.split(":", maxsplit=1)[1]
+                    record_name = self.record_info.record.name.removeprefix(
+                        self.record_prefix + ":"
+                    )
 
                     assert record_name in self.all_values_dict
                     old_val = self.all_values_dict[record_name]
@@ -408,7 +413,6 @@ class _TimeRecordUpdater(_RecordUpdater):
     of `time` do not have a `MIN` attribute."""
 
     base_record: RecordWrapper
-    record_prefix: str
     is_type_time: bool
 
     async def update(self, new_val: Any):
@@ -646,6 +650,7 @@ def _create_record_info(
         ):
             record_updater = _RecordUpdater(
                 record_info,
+                self._record_prefix,
                 self._client,
                 self._all_values_dict,
                 labels if labels else None,
@@ -717,11 +722,11 @@ def _make_time(
         )
         updater = _TimeRecordUpdater(
             record_dict[units_record_name],
+            self._record_prefix,
             self._client,
             self._all_values_dict,
             labels,
             time_record_info.record,
-            self._record_prefix,
             isinstance(field_info, TimeFieldInfo),
         )
 
@@ -1425,7 +1430,7 @@ def _make_action_write(
         )
 
         updater = _WriteRecordUpdater(
-            record_info, self._client, self._all_values_dict, None
+            record_info, self._record_prefix, self._client, self._all_values_dict, None
         )
 
         record_info.add_record(record_info.record)
diff --git a/tests/fixtures/mocked_panda.py b/tests/fixtures/mocked_panda.py
index 7c2b9c0c..990d08bd 100644
--- a/tests/fixtures/mocked_panda.py
+++ b/tests/fixtures/mocked_panda.py
@@ -88,11 +88,11 @@ def mocked_time_record_updater(
         yield (
             _TimeRecordUpdater(
                 mocked_record_info,
+                new_random_test_prefix,
                 client,
                 {},
                 ["TEST1", "TEST2", "TEST3"],
                 base_record,
-                new_random_test_prefix,
                 True,
             ),
             new_random_test_prefix,
diff --git a/tests/test_ioc.py b/tests/test_ioc.py
index e8a63230..977901d9 100644
--- a/tests/test_ioc.py
+++ b/tests/test_ioc.py
@@ -51,10 +51,11 @@ def record_updater() -> _RecordUpdater:
     client.send = AsyncMock()  # type: ignore
     record_info = RecordInfo(float)
     mocked_record = MagicMock()
-    mocked_record.name = "PREFIX:ABC:DEF"
+    record_prefix = "PREFIX:ES"
+    mocked_record.name = record_prefix + ":ABC:DEF"
     record_info.add_record(mocked_record)
 
-    return _RecordUpdater(record_info, client, {}, None)
+    return _RecordUpdater(record_info, record_prefix, client, {}, None)
 
 
 @pytest.fixture