diff --git a/tool/lib/leakchecker.rb b/tool/lib/leakchecker.rb
index 4b01d57792..1d45a3a8df 100644
--- a/tool/lib/leakchecker.rb
+++ b/tool/lib/leakchecker.rb
@@ -112,7 +112,7 @@ class LeakChecker
       }
       unless fd_leaked.empty?
         unless @@try_lsof == false
-          @@try_lsof |= system("lsof -p #$$", out: MiniTest::Unit.output)
+          @@try_lsof |= system(*%W[lsof -a -d #{fd_leaked.minmax.uniq.join("-")} -p #$$], out: MiniTest::Unit.output)
         end
       end
       h.each {|fd, list|