diff --git a/testing/simulator/src/cli.rs b/testing/simulator/src/cli.rs
index 5dc2d5ec8..ff8020105 100644
--- a/testing/simulator/src/cli.rs
+++ b/testing/simulator/src/cli.rs
@@ -25,8 +25,8 @@ pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
                         .default_value("4")
                         .help("Number of beacon nodes"))
                     .arg(Arg::with_name("proposer-nodes")
-                        .short("n")
-                        .long("nodes")
+                        .short("p")
+                        .long("proposer_nodes")
                         .takes_value(true)
                         .default_value("2")
                         .help("Number of proposer-only beacon nodes"))
@@ -64,8 +64,8 @@ pub fn cli_app<'a, 'b>() -> App<'a, 'b> {
                         .default_value("4")
                         .help("Number of beacon nodes"))
                     .arg(Arg::with_name("proposer-nodes")
-                        .short("n")
-                        .long("nodes")
+                        .short("p")
+                        .long("proposer_nodes")
                         .takes_value(true)
                         .default_value("2")
                         .help("Number of proposer-only beacon nodes"))