diff --git a/src/sdf_xarray/sdf_interface.pyx b/src/sdf_xarray/sdf_interface.pyx
index c611710..33ddbe1 100644
--- a/src/sdf_xarray/sdf_interface.pyx
+++ b/src/sdf_xarray/sdf_interface.pyx
@@ -4,8 +4,11 @@ import dataclasses
 import time
 
 from libc.string cimport memcpy
+
 import numpy as np
+
 cimport numpy as cnp
+
 cnp.import_array()