diff --git a/testnet/stacks-node/src/burnchains/mocknet_controller.rs b/testnet/stacks-node/src/burnchains/mocknet_controller.rs
index df28933f9..cbd048c28 100644
--- a/testnet/stacks-node/src/burnchains/mocknet_controller.rs
+++ b/testnet/stacks-node/src/burnchains/mocknet_controller.rs
@@ -208,6 +208,6 @@ impl BurnchainController for MocknetController {
     }
 
     #[cfg(test)]
-    fn bootstrap_chain(&mut self, num_blocks: u64) {}
+    fn bootstrap_chain(&mut self, _num_blocks: u64) {}
 }