diff --git a/src/defmt.rs b/src/defmt.rs
index c50963c0..6d547c09 100644
--- a/src/defmt.rs
+++ b/src/defmt.rs
@@ -1,6 +1,6 @@
 //! Defmt implementations for heapless types
 
-use crate::{storage::Storage, vec::VecInner};
+use crate::{storage::Storage, string::StringInner, vec::VecInner};
 use defmt::Formatter;
 
 impl<T, S: Storage> defmt::Format for VecInner<T, S>
@@ -12,7 +12,7 @@ where
     }
 }
 
-impl<const N: usize> defmt::Format for crate::String<N>
+impl<S: Storage> defmt::Format for StringInner<S>
 where
     u8: defmt::Format,
 {
diff --git a/src/ufmt.rs b/src/ufmt.rs
index fd0b276c..002ce04c 100644
--- a/src/ufmt.rs
+++ b/src/ufmt.rs
@@ -1,7 +1,7 @@
-use crate::{storage::Storage, string::String, vec::VecInner};
+use crate::{storage::Storage, string::StringInner, vec::VecInner};
 use ufmt_write::uWrite;
 
-impl<const N: usize> uWrite for String<N> {
+impl<S: Storage> uWrite for StringInner<S> {
     type Error = ();
     fn write_str(&mut self, s: &str) -> Result<(), Self::Error> {
         self.push_str(s)