diff --git a/ident/snowflake/snowflake.go b/ident/snowflake/snowflake.go
index 6415f06..7a0c571 100644
--- a/ident/snowflake/snowflake.go
+++ b/ident/snowflake/snowflake.go
@@ -13,7 +13,7 @@ import (
 
 // nodeNumber range from 0 to 1023 is used for generating unique node ID.
 var (
-	nodeNumber = rand.Int63n(1023)
+	nodeNumber = rand.Int64N(1023)
 	bitSize    = 0 // bitSize is used to store the length of generated ID.
 )