diff --git a/rust/src/lancedb_ops.rs b/rust/src/lancedb_ops.rs
index b8ecd64..8bcbef0 100644
--- a/rust/src/lancedb_ops.rs
+++ b/rust/src/lancedb_ops.rs
@@ -451,7 +451,7 @@ impl LanceDBOps {
                     if let Ok(cnt) = rt().block_on(tbl.count_rows(None)) { m = cnt; }
                     // tombstone_count = memories 中 is_deleted=true 的行（软删审计语义；
                     // SoftDelete 持久化标记 is_deleted 而非写独立 tombstones 表，2026-09-06 修正统计源）
-                    if let Ok(tc) = rt().block_on(tbl.count_rows(Some("is_deleted = true"))) { t = tc; }
+                    if let Ok(tc) = rt().block_on(tbl.count_rows(Some("is_deleted = true".to_string()))) { t = tc; }
                 } else if let Ok(cnt) = rt().block_on(tbl.count_rows(None)) {
                     match name.as_str() {
                         "episodes" => e = cnt,