diff --git a/src/init.cpp b/src/init.cpp
index c3a326841..21a566848 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -44,6 +44,7 @@
 #include <boost/filesystem.hpp>
 #include <boost/function.hpp>
 #include <boost/interprocess/sync/file_lock.hpp>
+#include <boost/lexical_cast.hpp>
 #include <boost/thread.hpp>
 #include <openssl/crypto.h>
 
@@ -269,7 +270,7 @@ std::string HelpMessage(HelpMessageMode mode)
     strUsage += HelpMessageOpt("-?", _("This help message"));
     strUsage += HelpMessageOpt("-alerts", strprintf(_("Receive and display P2P network alerts (default: %u)"), DEFAULT_ALERTS));
     strUsage += HelpMessageOpt("-alertnotify=<cmd>", _("Execute command when a relevant alert is received or we see a really long fork (%s in cmd is replaced by message)"));
-    strUsage += HelpMessageOpt("-blocknotify=<cmd>", _("Execute command when the best block changes (%s in cmd is replaced by block hash)"));
+    strUsage += HelpMessageOpt("-blocknotify=<cmd>", _("Execute command when the best block changes (%s in cmd is replaced by block hash, %i is replaced by block number)"));
     strUsage += HelpMessageOpt("-checkblocks=<n>", strprintf(_("How many blocks to check at startup (default: %u, 0 = all)"), 288));
     strUsage += HelpMessageOpt("-checklevel=<n>", strprintf(_("How thorough the block verification of -checkblocks is (0-4, default: %u)"), 3));
     strUsage += HelpMessageOpt("-conf=<file>", strprintf(_("Specify configuration file (default: %s)"), "bitcoin.conf"));
@@ -452,11 +453,12 @@ std::string LicenseInfo()
            "\n";
 }
 
-static void BlockNotifyCallback(const uint256& hashNewTip)
+static void BlockNotifyCallback(const uint256& hashNewTip, const int nHeight)
 {
     std::string strCmd = GetArg("-blocknotify", "");
 
     boost::replace_all(strCmd, "%s", hashNewTip.GetHex());
+    boost::replace_all(strCmd, "%i", boost::lexical_cast<std::string>(chainActive.Height()));
     boost::thread t(runCommand, strCmd); // thread runs free
 }
 
diff --git a/src/main.cpp b/src/main.cpp
index 92d425ab8..8d408a34b 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -2424,7 +2424,7 @@ bool ActivateBestChain(CValidationState &state, CBlock *pblock) {
                         pnode->PushInventory(CInv(MSG_BLOCK, hashNewTip));
             }
             // Notify external listeners about the new tip.
-            uiInterface.NotifyBlockTip(hashNewTip);
+            uiInterface.NotifyBlockTip(hashNewTip, pindexNewTip->nHeight);
         }
     } while(pindexMostWork != chainActive.Tip());
     CheckBlockIndex();
diff --git a/src/ui_interface.h b/src/ui_interface.h
index 32a92a4b8..34ac7bf3b 100644
--- a/src/ui_interface.h
+++ b/src/ui_interface.h
@@ -94,7 +94,7 @@ public:
     boost::signals2::signal<void (const std::string &title, int nProgress)> ShowProgress;
 
     /** New block has been accepted */
-    boost::signals2::signal<void (const uint256& hash)> NotifyBlockTip;
+    boost::signals2::signal<void (const uint256& hash, const int nHeight)> NotifyBlockTip;
 };
 
 extern CClientUIInterface uiInterface;