diff --git a/internal/2015/register.go b/internal/2015/register.go
index 92812f7..93e48c2 100644
--- a/internal/2015/register.go
+++ b/internal/2015/register.go
@@ -4,6 +4,7 @@ import (
 	_ "advent-of-code/internal/2015/DayEight"
 	_ "advent-of-code/internal/2015/DayFive"
 	_ "advent-of-code/internal/2015/DayFour"
+	_ "advent-of-code/internal/2015/DayNine"
 	_ "advent-of-code/internal/2015/DayOne"
 	_ "advent-of-code/internal/2015/DaySeven"
 	_ "advent-of-code/internal/2015/DaySix"