diff --git a/sky/clouds/service_catalog/data_fetchers/fetch_gcp.py b/sky/clouds/service_catalog/data_fetchers/fetch_gcp.py
index 3a4b177fa2a..e95e1c83a6e 100644
--- a/sky/clouds/service_catalog/data_fetchers/fetch_gcp.py
+++ b/sky/clouds/service_catalog/data_fetchers/fetch_gcp.py
@@ -10,7 +10,7 @@
 import multiprocessing
 import os
 import textwrap
-from typing import Any, Callable, Dict, List, Optional
+from typing import Any, Callable, Dict, List, Optional, Set
 
 import google.auth
 from googleapiclient import discovery
@@ -83,8 +83,8 @@
 tpu_client = discovery.build('tpu', 'v1')
 
 SINGLE_THREADED = False
-ZONES: List[str] = []
-EXCLUDED_REGIONS: List[str] = []
+ZONES: Set[str] = set()
+EXCLUDED_REGIONS: Set[str] = set()
 
 
 def get_skus(service_id: str) -> List[Dict[str, Any]]:
@@ -148,18 +148,17 @@ def filter_zones(func: Callable[[], List[str]]) -> Callable[[], List[str]]:
     removes any zones present in the global EXCLUDED_REGIONS (if defined).
     """
 
-    def wrapper(*arguments,
-                **keyword_args) -> List[str]:  # Renamed args to arguments
+    def wrapper(*arguments, **kwargs) -> List[str]:  # Renamed args to arguments
         # Get the original zones from the decorated function
-        original_zones = set(func(*arguments, **keyword_args))
+        original_zones = set(func(*arguments, **kwargs))
 
         # Intersect with ZONES if defined
         if ZONES:
-            original_zones &= set(ZONES)
+            original_zones &= ZONES
 
         # Remove zones from EXCLUDED_REGIONS if defined
         if EXCLUDED_REGIONS:
-            original_zones -= set(EXCLUDED_REGIONS)
+            original_zones -= EXCLUDED_REGIONS
 
         return list(original_zones)
 
@@ -533,10 +532,10 @@ def get_catalog_df(region_prefix: str) -> pd.DataFrame:
     args = parser.parse_args()
 
     SINGLE_THREADED = args.single_threaded
-    ZONES = args.zones
-    EXCLUDED_REGIONS = args.exclude
+    ZONES = set(args.zones)
+    EXCLUDED_REGIONS = set(args.exclude)
 
-    region_prefix_filter = '' if args.all_regions else 'us-'
+    region_prefix_filter = '' if args.zones or args.all_regions else 'us-'
     catalog_df = get_catalog_df(region_prefix_filter)
 
     os.makedirs('gcp', exist_ok=True)