diff --git a/internal/2016/register.go b/internal/2016/register.go
index 1908d00..a935acf 100644
--- a/internal/2016/register.go
+++ b/internal/2016/register.go
@@ -1,6 +1,7 @@
 package year2016
 
 import (
+	_ "advent-of-code/internal/2016/DayFour"
 	_ "advent-of-code/internal/2016/DayOne"
 	_ "advent-of-code/internal/2016/DayThree"
 	_ "advent-of-code/internal/2016/DayTwo"