diff --git a/rpc/src/lib.rs b/rpc/src/lib.rs
index 841cbb3e8b..a6a0bdec1d 100644
--- a/rpc/src/lib.rs
+++ b/rpc/src/lib.rs
@@ -88,7 +88,7 @@ impl<B, C, SC, P, CT> EthApiT for EthApi<B, C, SC, P, CT> where
 	}
 
 	fn is_mining(&self) -> Result<bool> {
-		unimplemented!("is_mining");
+		Ok(false)
 	}
 
 	fn chain_id(&self) -> Result<Option<U64>> {