diff --git a/beacon_node/src/cli.rs b/beacon_node/src/cli.rs
index 00fa726757..e86cc3b42c 100644
--- a/beacon_node/src/cli.rs
+++ b/beacon_node/src/cli.rs
@@ -558,7 +558,7 @@ pub fn cli_app() -> Command {
                 .long("disable-attesting")
                 .help("Turn off attestation related APIs so that we have some hope of producing \
                        blocks")
-                .action(ArgAction::Set)
+                .action(ArgAction::SetTrue)
                 .display_order(0)
         )
         .arg(