diff --git a/pyasic/miners/base.py b/pyasic/miners/base.py
index 2bd9a1d5..e58da5c0 100644
--- a/pyasic/miners/base.py
+++ b/pyasic/miners/base.py
@@ -345,13 +345,14 @@ class BaseMiner(ABC):
         """
         pass
 
+    @abstractmethod
     async def is_mining(self, *args, **kwargs) -> Optional[bool]:
         """Check whether the miner is mining.
 
         Returns:
             A boolean value representing if the miner is mining.
         """
-        return None
+        pass
 
     async def _get_data(self, allow_warning: bool, data_to_get: list = None) -> dict:
         if not data_to_get: