diff --git a/agenda/fx.py b/agenda/fx.py
index 737b43a..de70146 100644
--- a/agenda/fx.py
+++ b/agenda/fx.py
@@ -85,7 +85,9 @@ def get_rates(config: flask.config.Config) -> dict[str, Decimal]:
         delta = now - recent
 
         full_path = os.path.join(fx_dir, recent_filename)
-        if recent_filename.endswith(file_suffix) and delta < timedelta(hours=12):
+        if recent_filename.endswith(file_suffix) and (
+            delta < timedelta(hours=12) or config["OFFLINE_MODE"]
+        ):
             return read_cached_rates(full_path, currencies)
 
     url = "http://api.exchangerate.host/live"