diff --git a/openhands/integrations/provider.py b/openhands/integrations/provider.py
index d0551805e1..7639919c66 100644
--- a/openhands/integrations/provider.py
+++ b/openhands/integrations/provider.py
@@ -60,6 +60,10 @@ PROVIDER_TOKEN_TYPE_WITH_JSON_SCHEMA = Annotated[
     PROVIDER_TOKEN_TYPE,
     WithJsonSchema({'type': 'object', 'additionalProperties': {'type': 'string'}}),
 ]
+CUSTOM_SECRETS_TYPE_WITH_JSON_SCHEMA = Annotated[
+    CUSTOM_SECRETS_TYPE,
+    WithJsonSchema({'type': 'object', 'additionalProperties': {'type': 'string'}}),
+]
 
 
 class SecretStore(BaseModel):
@@ -67,8 +71,8 @@ class SecretStore(BaseModel):
         default_factory=lambda: MappingProxyType({})
     )
 
-    custom_secrets: CUSTOM_SECRETS_TYPE = Field(
-        default_factory=lambda: MappingProxyType({})
+    custom_secrets: CUSTOM_SECRETS_TYPE_WITH_JSON_SCHEMA = Field(
+        default_factory=lambda: MappingProxyType({}),
     )
 
     model_config = {