diff --git a/src/header.rs b/src/header.rs
index c055355..a2dc921 100644
--- a/src/header.rs
+++ b/src/header.rs
@@ -8,6 +8,7 @@ pub struct Header {
     /// The type of JWS: it can only be "JWT" here
     ///
     /// Defined in [RFC7515#4.1.9](https://tools.ietf.org/html/rfc7515#section-4.1.9).
+    #[serde(skip_serializing_if = "Option::is_none")]
     typ: Option<String>,
     /// The algorithm used
     ///