diff --git a/volatility3/framework/automagic/symbol_cache.py b/volatility3/framework/automagic/symbol_cache.py
index efe1ce601..47ff66121 100644
--- a/volatility3/framework/automagic/symbol_cache.py
+++ b/volatility3/framework/automagic/symbol_cache.py
@@ -151,7 +151,7 @@ class CacheManagerInterface(interfaces.configuration.VersionableInterface):
         Returns:
             A tuple of base_types, types, enums, symbols, or None is location not found"""
 
-    def get_hash(self, location: str) -> bool:
+    def get_hash(self, location: str) -> Optional[str]:
         """Returns the hash of the JSON from within a location ISF"""