diff --git a/src/icesat2_tracks/analysis_db/B05_define_angle.py b/src/icesat2_tracks/analysis_db/B05_define_angle.py
index b33c7358..f201c207 100644
--- a/src/icesat2_tracks/analysis_db/B05_define_angle.py
+++ b/src/icesat2_tracks/analysis_db/B05_define_angle.py
@@ -12,7 +12,7 @@
     font_for_print    
 )
 
-import icesat2_tracks.ICEsat2_SI_tools.io as io
+import icesat2_tracks.ICEsat2_SI_tools.iotools as io
 import icesat2_tracks.ICEsat2_SI_tools.spectral_estimates as spec
 
 import xarray as xr