diff --git a/crates/primitives/src/jsonu256.rs b/crates/primitives/src/jsonu256.rs
index acc6095529..ee39e1d1bc 100644
--- a/crates/primitives/src/jsonu256.rs
+++ b/crates/primitives/src/jsonu256.rs
@@ -90,4 +90,12 @@ mod test {
             ]
         );
     }
+
+    #[test]
+    fn jsonu256_serialize() {
+        let data = JsonU256(U256::from(16));
+        let serialized = serde_json::to_string(&data).unwrap();
+
+        assert_eq!(serialized, r#""16""#);
+    }
 }