diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6d3f409..412758f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 # [unreleased]
 
+## Fixed
+
+- Remove `Default` derive on CDS time provider. This can lead to uninitialized preamble fields.
+
 ## Changed
 
 - `serde` support is now optional and behind the `serde` feature.
diff --git a/src/time/cds.rs b/src/time/cds.rs
index b22015b..f826803 100644
--- a/src/time/cds.rs
+++ b/src/time/cds.rs
@@ -124,7 +124,7 @@ pub fn precision_from_pfield(pfield: u8) -> SubmillisPrecision {
 ///     assert_eq!(stamp_deserialized.len_as_bytes(), 7);
 /// }
 /// ```
-#[derive(Debug, Copy, Clone, Default, PartialEq, Eq)]
+#[derive(Debug, Copy, Clone, PartialEq, Eq)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub struct TimeProvider<DaysLen: ProvidesDaysLength = DaysLen16Bits> {
     pfield: u8,