diff --git a/src/rpcblockchain.cpp b/src/rpcblockchain.cpp
index 3c4b926a2..e9cf54bb4 100644
--- a/src/rpcblockchain.cpp
+++ b/src/rpcblockchain.cpp
@@ -1417,13 +1417,13 @@ UniValue getchaintips(const UniValue& params, bool fHelp)
     /* Build up a list of chain tips.  We start with the list of all
        known blocks, and successively remove blocks that appear as pprev
        of another block.  */
-    static pthread_mutex_t mutex; static int32_t didinit;
+    /*static pthread_mutex_t mutex; static int32_t didinit;
     if ( didinit == 0 )
     {
         pthread_mutex_init(&mutex,NULL);
         didinit = 1;
     }
-    pthread_mutex_lock(&mutex);
+    pthread_mutex_lock(&mutex);*/
     std::set<const CBlockIndex*, CompareBlocksByHeight> setTips;
     int32_t n = 0;
     BOOST_FOREACH(const PAIRTYPE(const uint256, CBlockIndex*)& item, mapBlockIndex)
@@ -1443,7 +1443,7 @@ UniValue getchaintips(const UniValue& params, bool fHelp)
             setTips.erase(pprev);
     }
     fprintf(stderr,"iterations getchaintips %d\n",n);
-    pthread_mutex_unlock(&mutex);
+    //pthread_mutex_unlock(&mutex);
 
     // Always report the currently active tip.
     setTips.insert(chainActive.LastTip());