diff --git a/test/test_rake_task_argument_parsing.rb b/test/test_rake_task_argument_parsing.rb
index e7826fd81..d5497525a 100644
--- a/test/test_rake_task_argument_parsing.rb
+++ b/test/test_rake_task_argument_parsing.rb
@@ -99,6 +99,7 @@ def test_no_rakeopt
     in_environment do
       ARGV << '--trace'
       app = Rake::Application.new
+      app.options.threads = Rake.application.options.threads
       app.init
       assert !app.options.silent
     end
@@ -108,6 +109,7 @@ def test_rakeopt_with_blank_options
     in_environment("RAKEOPT" => "") do
       ARGV << '--trace'
       app = Rake::Application.new
+      app.options.threads = Rake.application.options.threads
       app.init
       assert !app.options.silent
     end
@@ -116,6 +118,7 @@ def test_rakeopt_with_blank_options
   def test_rakeopt_with_silent_options
     in_environment("RAKEOPT" => "-s") do
       app = Rake::Application.new
+      app.options.threads = Rake.application.options.threads
       app.init
       assert app.options.silent
     end
diff --git a/test/test_rake_win32.rb b/test/test_rake_win32.rb
index d6ba0f201..15133aeff 100644
--- a/test/test_rake_win32.rb
+++ b/test/test_rake_win32.rb
@@ -72,6 +72,7 @@ def test_win32_backtrace_with_different_case
     ex.set_backtrace ['abc', 'rakefile']
 
     rake = Rake::Application.new
+    rake.options.threads = Rake.application.options.threads
     rake.options.trace = true
     rake.instance_variable_set(:@rakefile, 'Rakefile')