diff --git a/freqtrade/rpc/api_server/api_schemas.py b/freqtrade/rpc/api_server/api_schemas.py
index d0e772848..98cc8e15a 100644
--- a/freqtrade/rpc/api_server/api_schemas.py
+++ b/freqtrade/rpc/api_server/api_schemas.py
@@ -132,13 +132,10 @@ class UnfilledTimeout(BaseModel):
     exit_timeout_count: Optional[int]
 
 
-class OrderTypeValues(Enum):
+class OrderTypeValues(str, Enum):
     limit = 'limit'
     market = 'market'
 
-    class Config:
-        use_enum_values = True
-
 
 class OrderTypes(BaseModel):
     buy: OrderTypeValues