diff --git a/msyd/pyxfiles/io.pyx b/msyd/pyxfiles/io.pyx
index 45df9e4..3b84d1d 100644
--- a/msyd/pyxfiles/io.pyx
+++ b/msyd/pyxfiles/io.pyx
@@ -22,7 +22,7 @@ from gc import collect
 
 cimport numpy as np
 
-from msyd.coords import Range
+from msyd.coords import Range, read_psf_range
 from msyd.multisyn import Multisyn
 from msyd.vars import SNV
 import msyd.util as util