diff --git a/config/duration.go b/config/duration.go
index 90cb2277d..44b56bc18 100644
--- a/config/duration.go
+++ b/config/duration.go
@@ -10,7 +10,7 @@ import (
 // Duration is custom type embedding a time.Duration which allows defining
 // methods such as serialization to YAML or JSON.
 type Duration struct {
-	time.Duration `validate:"required"`
+	time.Duration
 }
 
 // DurationCustomTypeFunc enables registration of our custom config.Duration