diff --git a/src/command_line.rs b/src/command_line.rs
index 179bab1..8e54229 100644
--- a/src/command_line.rs
+++ b/src/command_line.rs
@@ -189,6 +189,10 @@
     #[structopt(long)]
     run_with_sessionctl: bool,
 
+    /// Use Use sessionctl to run the binary.
+    #[structopt(short = "K", long)]
+    kill_all: bool,
+
     /// Directory of app as it appears in the manifest file.
     #[structopt(long, default_value = "bin")]
     app_dir: String,
@@ -561,6 +565,11 @@
         FargoCommand::Run(run) => {
             let mut params = vec![];
 
+            if run.kill_all {
+                ssh(opt.verbose, &fuchsia_config, &target_options, "killall *fargo.cmx")
+                    .unwrap_or_default();
+            }
+
             if let Some(package) = run.package.as_ref() {
                 params.push("--package");
                 params.push(package);
diff --git a/src/lib.rs b/src/lib.rs
index 23f13f0..f704c3d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -359,7 +359,6 @@
         // http://fuchsia.googlesource.com/fuchsia/+/08dce526941ac5be23cec1b50f841aad5ed37ea1/build/config/BUILD.gn#547
         "--cfg=rust_panic=\"abort\"".to_string(),
         "-Clink-arg=--pack-dyn-relocs=relr".to_string(),
-        "-Clink-arg=--threads".to_string(),
         format!("-Clink-arg=-L{}", sysroot_lib),
         format!("-Clink-arg=-L{}/gen/zircon/public/lib/fdio", shared_lib_path.to_string_lossy(),),
         format!("-Clink-arg=-L{}/gen/zircon/public/lib/syslog", shared_lib_path.to_string_lossy(),),