diff --git a/lib/rake/task_arguments.rb b/lib/rake/task_arguments.rb
index ecd27ab75..24abebcea 100644
--- a/lib/rake/task_arguments.rb
+++ b/lib/rake/task_arguments.rb
@@ -95,7 +95,7 @@ def fetch(*args, &block)
     end
 
     def deconstruct_keys(keys)
-      @hash.slice(*keys)
+      keys ? @hash.slice(*keys) : to_hash
     end
 
     protected
diff --git a/test/test_rake_task_arguments.rb b/test/test_rake_task_arguments.rb
index 2706827e5..371b4e737 100644
--- a/test/test_rake_task_arguments.rb
+++ b/test/test_rake_task_arguments.rb
@@ -58,7 +58,8 @@ def test_deconstruct_keys
     omit "No stable pattern matching until Ruby 3.1 (testing #{RUBY_VERSION})" if RUBY_VERSION < "3.1"
 
     ta = Rake::TaskArguments.new([:a, :b, :c], [1, 2, 3])
-    assert_equal ta.deconstruct_keys([:a, :b]), { a: 1, b: 2 }
+    assert_equal({ a: 1, b: 2, c: 3 }, ta.deconstruct_keys(nil))
+    assert_equal({ a: 1, b: 2 },       ta.deconstruct_keys([:a, :b]))
   end
 
   def test_enumerable_behavior