diff --git a/wally/node_interfaces.py b/wally/node_interfaces.py
index c494b8d..caca8cc 100644
--- a/wally/node_interfaces.py
+++ b/wally/node_interfaces.py
@@ -70,7 +70,7 @@
         pass
 
     @abc.abstractmethod
-    def run(self, cmd: str, timeout: int = 60, nolog: bool = False) -> str:
+    def run(self, cmd: str, timeout: int = 60, nolog: bool = False, check_timeout: float = 0.01) -> str:
         pass
 
     @abc.abstractmethod
@@ -90,7 +90,7 @@
         pass
 
     @abc.abstractmethod
-    def disconnect(self) -> str:
+    def disconnect(self) -> None:
         pass
 
     @abc.abstractmethod