diff --git a/src/scilpy/cli/scil_tractogram_segment_connections_from_labels.py b/src/scilpy/cli/scil_tractogram_segment_connections_from_labels.py
index 102519f78..ff9e690e0 100755
--- a/src/scilpy/cli/scil_tractogram_segment_connections_from_labels.py
+++ b/src/scilpy/cli/scil_tractogram_segment_connections_from_labels.py
@@ -284,6 +284,7 @@ def main():
     # Get the indices of the voxels traversed by each streamline
     logging.info('*** Computing voxels traversed by each streamline ***')
     time1 = time.time()
+    sft.streamlines._data = sft.streamlines._data.astype(np.float32)
     indices, points_to_idx = streamlines_to_voxel_coordinates(
         sft.streamlines,
         return_mapping=True
diff --git a/src/scilpy/tractograms/streamline_and_mask_operations.py b/src/scilpy/tractograms/streamline_and_mask_operations.py
index faa0fcce5..93192fcab 100644
--- a/src/scilpy/tractograms/streamline_and_mask_operations.py
+++ b/src/scilpy/tractograms/streamline_and_mask_operations.py
@@ -114,6 +114,7 @@ def get_head_tail_density_maps(sft, point_to_select=1, to_millimeters=False,
 
     dimensions = sft.dimensions
     # Get the indices of the voxels intersected
+    streamlines._data = streamlines._data.astype(np.float32)
     list_indices, points_to_indices = streamlines_to_voxel_coordinates(
         streamlines, return_mapping=True)
 
@@ -328,6 +329,7 @@ def cut_streamlines_with_mask(sft, mask,
 
     # Get the indices of the voxels
     # intersected by the streamlines and the mapping from points to indices
+    sft.streamlines._data = sft.streamlines._data.astype(np.float32)
     indices, points_to_idx = streamlines_to_voxel_coordinates(
         sft.streamlines,
         return_mapping=True
@@ -429,6 +431,7 @@ def cut_streamlines_between_labels(
     mask = label_data_2 != unique_vals[1]
     label_data_2[mask] = 0
 
+    sft.streamlines._data = sft.streamlines._data.astype(np.float32)
     (indices, points_to_idx) = streamlines_to_voxel_coordinates(
         sft.streamlines,
         return_mapping=True