diff --git a/ublox-cellular/src/error.rs b/ublox-cellular/src/error.rs
index 57e6999..dd7b684 100644
--- a/ublox-cellular/src/error.rs
+++ b/ublox-cellular/src/error.rs
@@ -30,6 +30,23 @@ pub enum Error {
     _Unknown,
 }
 
+#[cfg(feature = "defmt")]
+impl defmt::Format for Error {
+    fn format(&self, f: defmt::Formatter<'_>) {
+        match self {
+            Self::BaudDetection => defmt::write!(f, "BaudDetection"),
+            Self::Busy => defmt::write!(f, "Busy"),
+            Self::Uninitialized => defmt::write!(f, "Uninitialized"),
+            Self::StateTimeout => defmt::write!(f, "StateTimeout"),
+            Self::Network(e) => defmt::write!(f, "Network({:?})", e),
+            Self::DataService(e) => defmt::write!(f, "DataService({:?})", e),
+            Self::Generic(e) => defmt::write!(f, "Generic({:?})", e),
+            Self::_Unknown => defmt::write!(f, "_Unknown"),
+            _ => defmt::write!(f, "non_exhaustive"),
+        }
+    }
+}
+
 impl From<DataServiceError> for Error {
     fn from(e: DataServiceError) -> Self {
         // Unwrap generic and network errors
diff --git a/ublox-cellular/src/services/data/error.rs b/ublox-cellular/src/services/data/error.rs
index 4a6c557..63468e5 100644
--- a/ublox-cellular/src/services/data/error.rs
+++ b/ublox-cellular/src/services/data/error.rs
@@ -3,6 +3,7 @@ use crate::network::Error as NetworkError;
 use ublox_sockets::Error as SocketError;
 
 #[derive(Debug, PartialEq)]
+#[cfg_attr(feature = "defmt", derive(defmt::Format))]
 pub enum Error {
     InvalidApn,
     SocketMemory,