diff --git a/tooling/backend_interface/src/lib.rs b/tooling/backend_interface/src/lib.rs
index 1d2d5364e2a..d6a9cd0d293 100644
--- a/tooling/backend_interface/src/lib.rs
+++ b/tooling/backend_interface/src/lib.rs
@@ -44,7 +44,7 @@ pub enum BackendError {
     InvalidUTF8Vector(Vec<u8>),
 
     #[error(
-        "The backend responded with a unexpected number of bytes. Expected: {0} but got {.1.len()} ({1:?})",
+        "The backend responded with a unexpected number of bytes. Expected: {0} but got {} ({1:?})", .1.len()
     )]
     UnexpectedNumberOfBytes(usize, Vec<u8>),