diff --git a/plugins/ceph/ceph-osd-info b/plugins/ceph/ceph-osd-info
index 7692600d..be4461ff 100755
--- a/plugins/ceph/ceph-osd-info
+++ b/plugins/ceph/ceph-osd-info
@@ -94,7 +94,7 @@ subgraphs=True
 def read_osd(filename):
 	s=socket.socket(socket.AF_UNIX,socket.SOCK_STREAM)
 	s.connect(filename)
-	s.send("\0\0\0\1")
+	s.send("{\"prefix\": \"perf dump\"}\0")
 	return json.loads(s.recv(10240)[4:])
 
 def osd_list():