diff --git a/lib/filewatch/tail.rb b/lib/filewatch/tail.rb
index befee93..1f0bc06 100644
--- a/lib/filewatch/tail.rb
+++ b/lib/filewatch/tail.rb
@@ -295,8 +295,8 @@ def _sincedb_write(sincedb_force_write=false)
       @sincedb_last_write = now
       @sincedb_write_pending = false
       @sincedb_writing = false
-
-      System.gc()
+      #it will raise error uninitialized contant FILEWATCH::TAIL:SYSTEM
+      #System.gc()
     end # def _sincedb_write
 
     public