diff --git a/echo.go b/echo.go
index b622d4e2..4ea44b42 100644
--- a/echo.go
+++ b/echo.go
@@ -191,6 +191,7 @@ const (
 	HeaderXHTTPMethodOverride = "X-HTTP-Method-Override"
 	HeaderXRealIP             = "X-Real-IP"
 	HeaderXRequestID          = "X-Request-ID"
+	HeaderXRequestedWith      = "X-Requested-With"
 	HeaderServer              = "Server"
 	HeaderOrigin              = "Origin"