diff --git a/puppet/files/puppet-check b/puppet/files/puppet-check
index b460cba..d724c44 100755
--- a/puppet/files/puppet-check
+++ b/puppet/files/puppet-check
@@ -34,7 +34,7 @@ begin
     Process.kill(0, pid)
 
     # check memory usage and restart if over 160M
-    rss = `ps -o rss -p '#{pid}'`.to_a.last.to_i / 1024
+    rss = `ps -o rss -p '#{pid}'`.split("\n").last.to_i / 1024
     if rss > 160
         err = sprintf("puppetd memory usage too high (%d MB), on host '%s' sending HUP\n",
                       rss, Socket.gethostname)