diff --git a/freqtrade/rpc/api_server/api_backtest.py b/freqtrade/rpc/api_server/api_backtest.py
index 7ce9f487f..edbc39772 100644
--- a/freqtrade/rpc/api_server/api_backtest.py
+++ b/freqtrade/rpc/api_server/api_backtest.py
@@ -63,12 +63,12 @@ async def api_start_backtest(bt_settings: BacktestRequest, background_tasks: Bac
                 not ApiServer._bt_data
                 or not ApiServer._bt_timerange
                 or lastconfig.get('timeframe') != strat.timeframe
+                or lastconfig.get('timerange') != btconfig['timerange']
             ):
                 ApiServer._bt_data, ApiServer._bt_timerange = ApiServer._bt.load_bt_data()
 
-                lastconfig['timerange'] = btconfig['timerange']
-                lastconfig['timeframe'] = strat.timeframe
-
+            lastconfig['timerange'] = btconfig['timerange']
+            lastconfig['timeframe'] = strat.timeframe
             lastconfig['protections'] = btconfig.get('protections', [])
             lastconfig['enable_protections'] = btconfig.get('enable_protections')
             lastconfig['dry_run_wallet'] = btconfig.get('dry_run_wallet')