diff --git a/test/ruby/test_thread.rb b/test/ruby/test_thread.rb
index cf3eefa25f..1baaf889cb 100644
--- a/test/ruby/test_thread.rb
+++ b/test/ruby/test_thread.rb
@@ -1257,7 +1257,7 @@ q.pop
       skip "can't trap a signal from another process on Windows"
       # opt = {new_pgroup: true}
     end
-    assert_separately([], "#{<<~"{#"}\n#{<<~'};'}")
+    assert_separately([], "#{<<~"{#"}\n#{<<~'};'}", timeout: 120)
     {#
       n = 1000
       sig = :INT