diff --git a/darwin/exporter/formats/nifti.py b/darwin/exporter/formats/nifti.py
index c0baec33a..64dcb353b 100644
--- a/darwin/exporter/formats/nifti.py
+++ b/darwin/exporter/formats/nifti.py
@@ -350,7 +350,7 @@ def populate_output_volumes_from_polygons(
                 plane,
                 frame_idx,
             )
-        return volume
+    return volume
 
 
 def populate_output_volumes_from_raster_layer(