diff --git a/varjoin/join.go b/varjoin/join.go
index bcf0f07..c32bc55 100644
--- a/varjoin/join.go
+++ b/varjoin/join.go
@@ -2,6 +2,6 @@
 
 package varjoin
 
-func Join(args ...string) string {
+func Join(sep string, args ...string) string {
 	return ""
 }