diff --git a/test/ruby/test_string_memory.rb b/test/ruby/test_string_memory.rb
index 3952d10343..249aa3a269 100644
--- a/test/ruby/test_string_memory.rb
+++ b/test/ruby/test_string_memory.rb
@@ -18,7 +18,14 @@ class TestStringMemory < Test::Unit::TestCase
       end
     end
 
-    return allocations
+    return allocations.map do |instance|
+      [
+        ObjectSpace.allocation_sourcefile(instance),
+        ObjectSpace.allocation_sourceline(instance),
+        instance.class,
+        instance,
+      ]
+    end
   ensure
     GC.enable
   end