diff --git a/test/rubygems/test_gem_stream_ui.rb b/test/rubygems/test_gem_stream_ui.rb
index 55907b0132..1326cd27ef 100644
--- a/test/rubygems/test_gem_stream_ui.rb
+++ b/test/rubygems/test_gem_stream_ui.rb
@@ -7,7 +7,7 @@ class TestGemStreamUI < Gem::TestCase
 
   # increase timeout with MJIT for --jit-wait testing
   mjit_enabled = defined?(RubyVM::MJIT) && RubyVM::MJIT.enabled?
-  SHORT_TIMEOUT = RUBY_ENGINE == "ruby" && !mjit_enabled ? 0.1 : 1.0
+  SHORT_TIMEOUT = (RUBY_ENGINE == "ruby" && !mjit_enabled) ? 0.1 : 1.0
 
   module IsTty
     attr_accessor :tty