diff --git a/crates/solvers-dto/src/lib.rs b/crates/solvers-dto/src/lib.rs
index 90fb40c06a..dcf603708d 100644
--- a/crates/solvers-dto/src/lib.rs
+++ b/crates/solvers-dto/src/lib.rs
@@ -66,7 +66,7 @@ mod serialize {
                 fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
                     write!(
                         formatter,
-                        "a hex-encoded string starting with \"0x\" containing {N} bytes",
+                        "a hex-encoded string starting with \"0x\" containing {N} bytes 2",
                     )
                 }