diff --git a/go/0217-contains-duplicate.go b/go/0217-contains-duplicate.go
index 280d3b8d8..d0b2ef020 100644
--- a/go/0217-contains-duplicate.go
+++ b/go/0217-contains-duplicate.go
@@ -1,12 +1,10 @@
 func containsDuplicate(nums []int) bool {
-	nums_map := map[int]int{}
+	nums_map := map[int]bool{}
 	for _, n := range nums {
-		if _, ok := nums_map[n]; !ok {
-			nums_map[n] = 1
-		} else {
+		if _, ok := nums_map[n]; ok {
 			return true
-		}
+		} 
+		nums_map[n] = true
 	}
 	return false
-
-}
\ No newline at end of file
+}