# must fail: fetch_OD_stale fetch_OT_stale_small
# bytes past covered_len are reused after a mismatch (session::advance_components)
diff --git a/wai/wai-rs/src/http_binding/session.rs b/wai/wai-rs/src/http_binding/session.rs
index ec31518e..d7874048 100644
--- a/wai/wai-rs/src/http_binding/session.rs
+++ b/wai/wai-rs/src/http_binding/session.rs
@@ -728,7 +728,7 @@ impl FetchSession {
                     self.abandoned.clear();
                     self.dropped.clear();
                     self.verified.clear();
-                    self.drop_from(head.covered_len());
+                    let _ = head.covered_len();
                     self.to_rest(&head, WhyWhole::DigestMismatch { index: i }, Class::Base);
                     return self.advance_rest();
                 }