diff --git a/cyw43/src/fmt.rs b/cyw43/src/fmt.rs
index 5730447b..9534c101 100644
--- a/cyw43/src/fmt.rs
+++ b/cyw43/src/fmt.rs
@@ -197,9 +197,6 @@ macro_rules! unwrap {
     }
 }
 
-#[cfg(feature = "defmt-timestamp-uptime")]
-defmt::timestamp! {"{=u64:us}", crate::time::Instant::now().as_micros() }
-
 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
 pub struct NoneError;
 
diff --git a/embassy-cortex-m/src/fmt.rs b/embassy-cortex-m/src/fmt.rs
index f8bb0a03..06697081 100644
--- a/embassy-cortex-m/src/fmt.rs
+++ b/embassy-cortex-m/src/fmt.rs
@@ -195,9 +195,6 @@ macro_rules! unwrap {
     }
 }
 
-#[cfg(feature = "defmt-timestamp-uptime")]
-defmt::timestamp! {"{=u64:us}", crate::time::Instant::now().as_micros() }
-
 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
 pub struct NoneError;
 
diff --git a/embassy-futures/src/fmt.rs b/embassy-futures/src/fmt.rs
index f8bb0a03..06697081 100644
--- a/embassy-futures/src/fmt.rs
+++ b/embassy-futures/src/fmt.rs
@@ -195,9 +195,6 @@ macro_rules! unwrap {
     }
 }
 
-#[cfg(feature = "defmt-timestamp-uptime")]
-defmt::timestamp! {"{=u64:us}", crate::time::Instant::now().as_micros() }
-
 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
 pub struct NoneError;
 
diff --git a/embassy-sync/src/fmt.rs b/embassy-sync/src/fmt.rs
index f8bb0a03..06697081 100644
--- a/embassy-sync/src/fmt.rs
+++ b/embassy-sync/src/fmt.rs
@@ -195,9 +195,6 @@ macro_rules! unwrap {
     }
 }
 
-#[cfg(feature = "defmt-timestamp-uptime")]
-defmt::timestamp! {"{=u64:us}", crate::time::Instant::now().as_micros() }
-
 #[derive(Debug, Copy, Clone, Eq, PartialEq)]
 pub struct NoneError;