diff --git a/lib/solid_queue/cli.rb b/lib/solid_queue/cli.rb
index a2b5ba5e..2f3f3e13 100644
--- a/lib/solid_queue/cli.rb
+++ b/lib/solid_queue/cli.rb
@@ -8,7 +8,7 @@ class Cli < Thor
       desc: "Path to config file (default: #{Configuration::DEFAULT_CONFIG_FILE_PATH}).",
       banner: "SOLID_QUEUE_CONFIG"
 
-    class_option :mode, type: :string, default: "fork", enum: %w[ fork async ],
+    class_option :mode, type: :string, enum: %w[ fork async ],
       desc: "Whether to fork processes for workers and dispatchers (fork) or to run these in the same process as the supervisor (async) (default: fork).",
       banner: "SOLID_QUEUE_SUPERVISOR_MODE"