diff --git a/plugins/mongodb/mongo_btree b/plugins/mongodb/mongo_btree
index 81da375b..820b2f04 100755
--- a/plugins/mongodb/mongo_btree
+++ b/plugins/mongodb/mongo_btree
@@ -16,7 +16,11 @@ def getServerStatus():
     return json.loads( raw )["serverStatus"]
 
 def get():
-    return getServerStatus()["indexCounters"]["btree"]
+    status = getServerStatus()
+    if status["version"] >= "2.4.0":
+        return getServerStatus()["indexCounters"]
+    else:
+        return getServerStatus()["indexCounters"]["btree"]
 
 def doData():
     for k,v in get().iteritems():
diff --git a/plugins/mongodb/mongo_lock b/plugins/mongodb/mongo_lock
index 5a846f50..af093a0e 100755
--- a/plugins/mongodb/mongo_lock
+++ b/plugins/mongodb/mongo_lock
@@ -18,7 +18,12 @@ def getServerStatus():
 name = "locked"
 
 def doData():
-    print name + ".value " + str( 100 * getServerStatus()["globalLock"]["ratio"] )
+    status = getServerStatus()
+    if status["version"] >= "2.2.0":
+        ratio = status["globalLock"]["lockTime"] / status["globalLock"]["totalTime"]
+    else:
+        ratio = status["globalLock"]["ratio"]
+    print name + ".value " + str( 100 * ratio )
 
 def doConfig():