diff --git a/test/ruby/test_gc.rb b/test/ruby/test_gc.rb
index 2895ca50bfd126..6b95e2a2e60038 100644
--- a/test/ruby/test_gc.rb
+++ b/test/ruby/test_gc.rb
@@ -261,9 +261,12 @@ def test_latest_gc_info_need_major_by
       objects.append(100.times.map { '*' })
     end
 
-    assert_not_nil GC.latest_gc_info(:need_major_by)
+    need_major_by = GC.latest_gc_info(:need_major_by)
     GC.start(full_mark: false) # should be upgraded to major
-    assert_not_nil GC.latest_gc_info(:major_by)
+    major_by = GC.latest_gc_info(:major_by)
+
+    assert_not_nil(need_major_by)
+    assert_not_nil(major_by)
   end
 
   def test_stress_compile_send