--- a/data/space_groups.db.PL
+++ b/data/space_groups.db.PL
@@ -63,6 +63,7 @@
 use File::Spec;
 ##Storable:
 use Storable qw/nstore/;
+$Storable::canonical = 1;
 ##end Storable:
 ##MLDBM:
 ## use MLDBM qw(DB_File Storable);
