diff --git a/wsireg/utils/im_utils.py b/wsireg/utils/im_utils.py
index 7aec4e6..9437f28 100644
--- a/wsireg/utils/im_utils.py
+++ b/wsireg/utils/im_utils.py
@@ -399,9 +399,7 @@ def func(
                 if subblock_ch_idx in channel_idx:
                     subblock.dimension_entries[czi_c_idx].start
                     tile = subblock.data(resize=resize, order=order)
-                    dvstart[ch_dim_idx] = subblock_ch_idx - min_ch_seq.get(
-                        subblock_ch_idx
-                    )
+                    dvstart[ch_dim_idx] = min_ch_seq.get(subblock_ch_idx)
                 else:
                     return
             else: