diff --git a/common/protocol/server_spec.go b/common/protocol/server_spec.go
index f6eefa1c..359d7c59 100644
--- a/common/protocol/server_spec.go
+++ b/common/protocol/server_spec.go
@@ -35,7 +35,7 @@ func BeforeTime(t time.Time) ValidationStrategy {
 	}
 }
 
-func (this TimeoutValidStrategy) IsValid() bool {
+func (this *TimeoutValidStrategy) IsValid() bool {
 	return this.until.After(time.Now())
 }