diff --git a/src/ape/api/providers.py b/src/ape/api/providers.py
index 49eec322b5..e78391670c 100644
--- a/src/ape/api/providers.py
+++ b/src/ape/api/providers.py
@@ -120,16 +120,16 @@ class ProviderAPI(BaseInterfaceModel):
     network: NetworkAPI
     """A reference to the network this provider provides."""
 
-    provider_settings: dict
+    provider_settings: Dict
     """The settings for the provider, as overrides to the configuration."""
 
     data_folder: Path
     """The path to the  ``.ape`` directory."""
 
-    request_header: dict
+    request_header: Dict
     """A header to set on HTTP/RPC requests."""
 
-    cached_chain_id: Optional[int] = None
+    cached_chain_id: Optional[int] = Field(None, exclude=True)
     """Implementation providers may use this to cache and re-use chain ID."""
 
     block_page_size: int = 100
@@ -1752,7 +1752,10 @@ def disconnect(self):
         Subclasses override this method to do provider-specific disconnection tasks.
         """
 
-        self.cached_chain_id = None  # type: ignore
+        # NOTE: Setting it this way mostly because of a mypy issue.
+        default_value = self.model_fields["cached_chain_id"].default
+        self.cached_chain_id = default_value
+
         if self.process:
             self.stop()
 
diff --git a/src/ape_test/provider.py b/src/ape_test/provider.py
index 7173079d65..3955d9b832 100644
--- a/src/ape_test/provider.py
+++ b/src/ape_test/provider.py
@@ -62,7 +62,7 @@ def connect(self):
         self._web3 = Web3(tester)
 
     def disconnect(self):
-        self.cached_chain_id = None  # type: ignore
+        self.cached_chain_id = None
         self._web3 = None
         self._evm_backend = None
 
@@ -111,7 +111,7 @@ def estimate_gas_cost(self, txn: TransactionAPI, **kwargs) -> int:
 
     @property
     def chain_id(self) -> int:
-        if self.cached_chain_id:
+        if self.cached_chain_id is not None:
             return self.cached_chain_id
 
         try: