diff --git a/day-4/one.go b/day-4/one.go
index 064492e..70fb4be 100644
--- a/day-4/one.go
+++ b/day-4/one.go
@@ -5,8 +5,6 @@ import (
 	"unicode"
 )
 
-type M map[string]interface{}
-
 // one computes points based on matching numbers
 func one(lines []string) (int, error) {