diff --git a/lib/thor.rb b/lib/thor.rb
index 8648505a..1d8e293c 100644
--- a/lib/thor.rb
+++ b/lib/thor.rb
@@ -474,9 +474,9 @@ def stop_on_unknown_option #:nodoc:
       @stop_on_unknown_option ||= []
     end
 
-    # help command has the required check disabled by default.
+    # help and tree commands have the required check disabled by default.
     def disable_required_check #:nodoc:
-      @disable_required_check ||= [:help]
+      @disable_required_check ||= [:help, :tree]
     end
 
     def print_exclusive_options(shell, command = nil) # :nodoc:
diff --git a/lib/thor/parser/options.rb b/lib/thor/parser/options.rb
index 17d0cee5..8e4e84c9 100644
--- a/lib/thor/parser/options.rb
+++ b/lib/thor/parser/options.rb
@@ -134,7 +134,7 @@ def parse(args) # rubocop:disable Metrics/MethodLength
 
       check_requirement! unless @disable_required_check
       check_exclusive!
-      check_at_least_one!
+      check_at_least_one! unless @disable_required_check
 
       assigns = Thor::CoreExt::HashWithIndifferentAccess.new(@assigns)
       assigns.freeze