diff --git a/core/src/trezor/loop.py b/core/src/trezor/loop.py
index 54f85eddeb..80ed8e160a 100644
--- a/core/src/trezor/loop.py
+++ b/core/src/trezor/loop.py
@@ -192,7 +192,7 @@ class Syscall:
 
     if TYPE_CHECKING:
 
-        def __await__(self) -> Generator:
+        def __await__(self) -> Generator[Any, Any, Any]:
             return self.__iter__()
 
     def handle(self, task: Task) -> None: