diff --git a/backend/loadtest/soak_sync.py b/backend/loadtest/soak_sync.py
index 02c10c4..29ffa11 100644
--- a/backend/loadtest/soak_sync.py
+++ b/backend/loadtest/soak_sync.py
@@ -417,7 +417,7 @@ def _report(cfg: Config, samples: list[Sample]) -> int:
             "RSS trend stable (<15%)",
             rss_growth <= rss_budget_pct,
             f"rss early {rss_early:.0f}MB -> late {rss_late:.0f}MB "
-            f"(+{rss_growth:.1f}%), peak {rss_max:.0f}MB",
+            f"({rss_growth:+.1f}%), peak {rss_max:.0f}MB",
         ),
     ]