diff --git a/appveyor.yml b/appveyor.yml
index 4503589899..6ff786684e 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -93,8 +93,8 @@ for:
     - nmake -l "TESTOPTS=-v -q" btest
     - nmake -l "TESTOPTS=-v -q" test-basic
     - nmake -l "TESTOPTS=-q -j%JOBS% --subprocess-timeout-scale=1.5" test-all RUBY_FORCE_TEST_JIT=1
-    # execute unstable tests separately without -j.
-    - nmake -l "TESTOPTS=-q --subprocess-timeout-scale=3.0" test-all TEST_EXCLUDES= TESTS="../test/win32ole/test_win32ole.rb ../test/ruby/test_thread_queue.rb"
+    # separately execute tests that may crash worker without -j.
+    - nmake -l "TESTOPTS=-q --subprocess-timeout-scale=1.5" test-all TEST_EXCLUDES= TESTS="../test/win32ole/test_win32ole.rb"
     - nmake -l test-spec
 -
   matrix:
diff --git a/test/excludes/TestThreadQueue.rb b/test/excludes/TestThreadQueue.rb
deleted file mode 100644
index 8e25cbeaaf..0000000000
--- a/test/excludes/TestThreadQueue.rb
+++ /dev/null
@@ -1,12 +0,0 @@
-if ENV['APPVEYOR'] == 'True' && RUBY_PLATFORM.match?(/mswin/)
-  exclude :test_queue_with_trap, 'too unstable on vs140'
-  # separately tested on appveyor.yml.
-end
-
-# https://ci.appveyor.com/project/ruby/ruby/build/9795/job/l9t4w9ks7arsldb1
-#   1) Error:
-# TestThreadQueue#test_queue_with_trap:
-# Timeout::Error: execution of assert_in_out_err expired timeout (30.0 sec)
-# pid 22988 exit 0
-# |
-#     C:/projects/ruby/test/ruby/test_thread_queue.rb:553:in `test_queue_with_trap'
diff --git a/test/ruby/test_thread_queue.rb b/test/ruby/test_thread_queue.rb
index 6ea37104c4..8cebbbecb4 100644
--- a/test/ruby/test_thread_queue.rb
+++ b/test/ruby/test_thread_queue.rb
@@ -550,6 +550,9 @@ class TestThreadQueue < Test::Unit::TestCase
   end
 
   def test_queue_with_trap
+    if ENV['APPVEYOR'] == 'True' && RUBY_PLATFORM.match?(/mswin/)
+      skip 'This test fails too often on AppVeyor vs140'
+    end
     assert_in_out_err([], <<-INPUT, %w(INT INT exit), [])
       q = Queue.new
       trap(:INT){