diff --git a/gdbstub_arch/src/aarch64/reg/id.rs b/gdbstub_arch/src/aarch64/reg/id.rs
index 27c4ca9..6c56960 100644
--- a/gdbstub_arch/src/aarch64/reg/id.rs
+++ b/gdbstub_arch/src/aarch64/reg/id.rs
@@ -44,6 +44,7 @@ impl RegId for AArch64RegId {
 
 #[allow(clippy::unusual_byte_groupings)]
 impl AArch64RegId {
+    #[allow(clippy::len_without_is_empty)]
     /// Gives the size of the register.
     pub fn len(&self) -> Option<usize> {
         match self {