diff --git a/acl/aclbit.go b/acl/aclbit.go
index bad609e..279b62e 100644
--- a/acl/aclbit.go
+++ b/acl/aclbit.go
@@ -27,7 +27,7 @@ func veryNumBit(n NumBit) bool {
 }
 
 // unite slice int to int64
-func Unite(a ...AclBit) AclBit {
+func Unite(a []AclBit) AclBit {
 	var endacl AclBit
 	for _, a0 := range a {
 		endacl = endacl | a0