diff --git a/freqtrade/rpc/api_server/deps.py b/freqtrade/rpc/api_server/deps.py
index 8fd105d3e..4c118d274 100644
--- a/freqtrade/rpc/api_server/deps.py
+++ b/freqtrade/rpc/api_server/deps.py
@@ -1,7 +1,7 @@
 from typing import Any, AsyncIterator, Dict, Optional
 from uuid import uuid4
 
-from fastapi import Depends
+from fastapi import Depends, HTTPException
 
 from freqtrade.enums import RunMode
 from freqtrade.persistence import Trade
@@ -57,5 +57,6 @@ def get_message_stream():
 
 def is_webserver_mode(config=Depends(get_config)):
     if config['runmode'] != RunMode.WEBSERVER:
-        raise RPCException('Bot is not in the correct state')
+        raise HTTPException(status_code=503,
+                            detail='Bot is not in the correct state.')
     return None
diff --git a/tests/rpc/test_rpc_apiserver.py b/tests/rpc/test_rpc_apiserver.py
index 5ba42f6ea..cdf620b90 100644
--- a/tests/rpc/test_rpc_apiserver.py
+++ b/tests/rpc/test_rpc_apiserver.py
@@ -1673,7 +1673,8 @@ def test_api_backtesting(botclient, mocker, fee, caplog, tmpdir):
 
         rc = client_get(client, f"{BASE_URI}/backtest")
         # Backtest prevented in default mode
-        assert_response(rc, 502)
+        assert_response(rc, 503)
+        assert rc.json()['detail'] == 'Bot is not in the correct state.'
 
         ftbot.config['runmode'] = RunMode.WEBSERVER
         # Backtesting not started yet
@@ -1812,7 +1813,9 @@ def test_api_backtest_history(botclient, mocker, testdatadir):
                      ])
 
     rc = client_get(client, f"{BASE_URI}/backtest/history")
-    assert_response(rc, 502)
+    assert_response(rc, 503)
+    assert rc.json()['detail'] == 'Bot is not in the correct state.'
+
     ftbot.config['user_data_dir'] = testdatadir
     ftbot.config['runmode'] = RunMode.WEBSERVER