diff --git a/day3.m b/day3.m
index 0869df6..afaf431 100644
--- a/day3.m
+++ b/day3.m
@@ -10,7 +10,6 @@
 :- import_module int.
 :- import_module char.
 :- import_module string.
-:- import_module exception.
 
 :- pred split(chars::in, chars::out, chars::out) is semidet.
 split(X, L, H) :-