diff --git a/internal/2018/register.go b/internal/2018/register.go
index 286f7f5..57fb218 100644
--- a/internal/2018/register.go
+++ b/internal/2018/register.go
@@ -1,6 +1,7 @@
 package year2018
 
 import (
+	_ "advent-of-code/internal/2018/DayFour"
 	_ "advent-of-code/internal/2018/DayOne"
 	_ "advent-of-code/internal/2018/DayThree"
 	_ "advent-of-code/internal/2018/DayTwo"