diff --git a/packages/core/src/arbitrary_value.rs b/packages/core/src/arbitrary_value.rs
index 792bf405c..27f9ac62a 100644
--- a/packages/core/src/arbitrary_value.rs
+++ b/packages/core/src/arbitrary_value.rs
@@ -2,6 +2,7 @@ use std::fmt::Formatter;
 
 // trying to keep values at 3 bytes
 #[cfg_attr(feature = "serialize", derive(serde::Serialize, serde::Deserialize))]
+#[cfg_attr(feature = "serialize", serde(untagged))]
 #[derive(Clone, Debug, PartialEq)]
 pub enum AttributeValue<'a> {
     Text(&'a str),