diff --git a/nptdms/base_segment.py b/nptdms/base_segment.py
index f3b5738..3f40642 100644
--- a/nptdms/base_segment.py
+++ b/nptdms/base_segment.py
@@ -56,14 +56,14 @@ def _read_data_chunk(self, file, data_objects, chunk_index):
         """
         raise NotImplementedError("Data chunk reading must be implemented in base classes")
 
-    def read_channel_data_chunks(self, file, data_objects, channel_path, chunk_offset, stop_chunk, chunk_size):
+    def read_channel_data_chunks(self, file, data_objects, channel_path, chunk_offset, stop_chunk):
         """ Read multiple data chunks for a single channel at once
             In the base case we read each chunk individually but subclasses can override this
         """
         for chunk_index in range(chunk_offset, stop_chunk):
-            yield self._read_channel_data_chunk(file, data_objects, chunk_index, channel_path, chunk_size)
+            yield self._read_channel_data_chunk(file, data_objects, chunk_index, channel_path)
 
-    def _read_channel_data_chunk(self, file, data_objects, chunk_index, channel_path, chunk_size):
+    def _read_channel_data_chunk(self, file, data_objects, chunk_index, channel_path):
         """ Read data from a chunk for a single channel
         """
         # In the base case we can read data for all channels
diff --git a/nptdms/tdms_segment.py b/nptdms/tdms_segment.py
index 61dba55..cacde39 100644
--- a/nptdms/tdms_segment.py
+++ b/nptdms/tdms_segment.py
@@ -383,7 +383,7 @@ def _read_channel_data_chunks(self, file, data_objects, channel_path, chunk_offs
         reader = self._get_data_reader()
         initial_position = file.tell()
         for i, chunk in enumerate(reader.read_channel_data_chunks(
-                file, data_objects, channel_path, chunk_offset, stop_chunk, chunk_size
+                file, data_objects, channel_path, chunk_offset, stop_chunk
         )):
             yield chunk
             file.seek(initial_position + (i + 1) * chunk_size)
@@ -461,7 +461,7 @@ def read_data_chunks(self, file, data_objects, num_chunks):
             raise ValueError("Cannot read interleaved data with different chunk sizes")
         return [self._read_interleaved_chunks(file, data_objects, num_chunks)]
 
-    def read_channel_data_chunks(self, file, data_objects, channel_path, chunk_offset, stop_chunk, chunk_size):
+    def read_channel_data_chunks(self, file, data_objects, channel_path, chunk_offset, stop_chunk):
         """ Read multiple data chunks for a single channel at once
         """
         num_chunks = stop_chunk - chunk_offset
@@ -513,7 +513,7 @@ def _read_data_chunk(self, file, data_objects, chunk_index):
             object_data[obj.path] = obj.read_values(file, number_values, self.endianness)
         return RawDataChunk.channel_data(object_data)
 
-    def _read_channel_data_chunk(self, file, data_objects, chunk_index, channel_path, chunk_size):
+    def _read_channel_data_chunk(self, file, data_objects, chunk_index, channel_path):
         """ Read data from a chunk for a single channel
         """
         channel_data = RawChannelDataChunk.empty()