diff --git a/test/ruby/test_process.rb b/test/ruby/test_process.rb
index 177af17724..e12b03801b 100644
--- a/test/ruby/test_process.rb
+++ b/test/ruby/test_process.rb
@@ -1364,6 +1364,7 @@ class TestProcess < Test::Unit::TestCase
     return unless Signal.list.include?("QUIT")
 
     with_tmpchdir do
+      GC.start
       s = assert_in_out_err([], "Process.kill(:SIGQUIT, $$);sleep 30", //, //, rlimit_core: 0)
       assert_equal([false, true, false, nil],
                    [s.exited?, s.signaled?, s.stopped?, s.success?],