diff --git a/test/objspace/test_objspace.rb b/test/objspace/test_objspace.rb
index 42fbc3e03c..e47917030a 100644
--- a/test/objspace/test_objspace.rb
+++ b/test/objspace/test_objspace.rb
@@ -165,6 +165,7 @@ class TestObjSpace < Test::Unit::TestCase
   end
 
   def test_trace_object_allocations
+    ObjectSpace.trace_object_allocations_clear # clear object_table to get rid of erroneous detection for c0
     Class.name
     o0 = Object.new
     ObjectSpace.trace_object_allocations{