diff --git a/CHANGELOG.md b/CHANGELOG.md
index ec5652d..95da44f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 # [unreleased]
 
+## Changed
+
+- `UnsignedByteField` and `GenericUnsignedByteField` `new` methods are `const` now.
+
 # [v0.7.0-beta.0] 2023-08-16
 
 - Moved MSRV from v1.60 to v1.61.
diff --git a/src/cfdp/pdu/mod.rs b/src/cfdp/pdu/mod.rs
index c0e1e20..6d93da9 100644
--- a/src/cfdp/pdu/mod.rs
+++ b/src/cfdp/pdu/mod.rs
@@ -718,6 +718,8 @@ mod tests {
         assert_eq!(default_conf.crc_flag, CrcFlag::NoCrc);
         assert_eq!(default_conf.file_flag, LargeFileFlag::Normal);
     }
+
+    #[test]
     fn test_pdu_header_setter() {
         let src_id = UnsignedByteFieldU8::new(1);
         let dest_id = UnsignedByteFieldU8::new(2);
diff --git a/src/util.rs b/src/util.rs
index 3fd41dc..4a71ea0 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -123,7 +123,7 @@ pub struct UnsignedByteField {
 }
 
 impl UnsignedByteField {
-    pub fn new(width: usize, value: u64) -> Self {
+    pub const fn new(width: usize, value: u64) -> Self {
         Self { width, value }
     }
 
@@ -204,7 +204,7 @@ pub struct GenericUnsignedByteField<TYPE> {
 }
 
 impl<TYPE> GenericUnsignedByteField<TYPE> {
-    pub fn new(val: TYPE) -> Self {
+    pub const fn new(val: TYPE) -> Self {
         Self { value: val }
     }
 }