diff --git a/src/funcchain/syntax/decorators.py b/src/funcchain/syntax/decorators.py
index c4af429..41a5774 100644
--- a/src/funcchain/syntax/decorators.py
+++ b/src/funcchain/syntax/decorators.py
@@ -24,7 +24,7 @@ def runnable(
     *,
     llm: UniversalChatModel = None,
     settings: SettingsOverride = {},
-) -> Callable[[Callable], Runnable]:
+) -> Callable[[Callable[..., OutputT]], Runnable[dict[str, Any], OutputT]]:
     ...