diff --git a/maputil/map.go b/maputil/map.go
index 465417c..b8cd70a 100644
--- a/maputil/map.go
+++ b/maputil/map.go
@@ -12,8 +12,6 @@ import (
 
 	"golang.org/x/exp/constraints"
 
-	"golang.org/x/exp/constraints"
-
 	"github.com/duke-git/lancet/v2/slice"
 )