diff --git a/suitcase/tiff_series/__init__.py b/suitcase/tiff_series/__init__.py
index e1b8e61..c868bc7 100644
--- a/suitcase/tiff_series/__init__.py
+++ b/suitcase/tiff_series/__init__.py
@@ -280,7 +280,7 @@ def event(self, doc):
                     Path(fname).parent.mkdir(parents=True, exist_ok=True)
                     tw = TiffWriter(fname, **self._init_kwargs)
                     self._tiff_writers[stream_name][field+f'-{num}'] = tw
-                    tw.write(img_asarray_2d, *self._kwargs)
+                    tw.write(img_asarray_2d, **self._kwargs)
 
 
 def get_prefixed_filename(
diff --git a/suitcase/tiff_stack/__init__.py b/suitcase/tiff_stack/__init__.py
index 5a8529c..fbf329c 100644
--- a/suitcase/tiff_stack/__init__.py
+++ b/suitcase/tiff_stack/__init__.py
@@ -300,7 +300,7 @@ def event_page(self, doc):
                         img_asarray_2d = img_asarray[i, :]
                         # append the image to the file
                         tw = self._tiff_writers[stream_name][field]
-                        tw.write(img_asarray_2d, contiguous=True, *self._kwargs)
+                        tw.write(img_asarray_2d, contiguous=True, **self._kwargs)
 
     def stop(self, doc):
         self.close()