1 files changed, 3 insertions, 5 deletions
diff --git a/openbb_platform/core/openbb_core/provider/standard_models/market_indices.py b/openbb_platform/core/openbb_core/provider/standard_models/market_indices.py
index eec1026bd73..04d24ad4878 100644
--- a/openbb_platform/core/openbb_core/provider/standard_models/market_indices.py
+++ b/openbb_platform/core/openbb_core/provider/standard_models/market_indices.py
@@ -4,7 +4,7 @@ from datetime import (
     date as dateType,
     datetime,
 )
-from typing import List, Optional, Set, Union
+from typing import Optional
 
 from dateutil import parser
 from pydantic import Field, StrictFloat, field_validator
@@ -30,11 +30,9 @@ class MarketIndicesQueryParams(QueryParams):
 
     @field_validator("symbol", mode="before", check_fields=False)
     @classmethod
-    def upper_symbol(cls, v: Union[str, List[str], Set[str]]):
+    def upper_symbol(cls, v: str) -> str:
         """Convert symbol to uppercase."""
-        if isinstance(v, str):
-            return v.upper()
-        return ",".join([symbol.upper() for symbol in list(v)])
+        return v.upper()
 
 
 class MarketIndicesData(Data):