diff --git a/embassy-stm32-wpan/src/lib.rs b/embassy-stm32-wpan/src/lib.rs
index 5ecce2cc..2a8ab725 100644
--- a/embassy-stm32-wpan/src/lib.rs
+++ b/embassy-stm32-wpan/src/lib.rs
@@ -3,7 +3,7 @@
 #![cfg_attr(feature = "mac", feature(type_alias_impl_trait, concat_bytes))]
 
 // This must go FIRST so that all the other modules see its macros.
-pub mod fmt;
+mod fmt;
 
 use core::mem::MaybeUninit;
 use core::sync::atomic::{compiler_fence, Ordering};
diff --git a/embassy-stm32/src/lib.rs b/embassy-stm32/src/lib.rs
index fb0279dc..adb3054d 100644
--- a/embassy-stm32/src/lib.rs
+++ b/embassy-stm32/src/lib.rs
@@ -5,7 +5,7 @@
 #![doc = document_features::document_features!(feature_label = r#"<span class="stab portability"><code>{feature}</code></span>"#)]
 
 // This must go FIRST so that all the other modules see its macros.
-pub mod fmt;
+mod fmt;
 include!(concat!(env!("OUT_DIR"), "/_macros.rs"));
 
 // Utilities