diff --git a/src/init.cpp b/src/init.cpp
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -932,9 +932,12 @@
     }
 
     std::string strCmd = gArgs.GetArg("-blocknotify", "");
-
-    boost::replace_all(strCmd, "%s", pBlockIndex->GetBlockHash().GetHex());
-    boost::thread t(runCommand, strCmd); // thread runs free
+    if (!strCmd.empty()) {
+        boost::replace_all(strCmd, "%s", pBlockIndex->GetBlockHash().GetHex());
+        std::thread t(runCommand, strCmd);
+        // thread runs free
+        t.detach();
+    }
 }
 
 static bool fHaveGenesis = false;
diff --git a/src/validation.cpp b/src/validation.cpp
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -45,13 +45,13 @@
 
 #include <atomic>
 #include <sstream>
+#include <thread>
 
 #include <boost/algorithm/string/join.hpp>
 #include <boost/algorithm/string/replace.hpp>
 #include <boost/filesystem/fstream.hpp>
 #include <boost/math/distributions/poisson.hpp>
 #include <boost/range/adaptor/reversed.hpp>
-#include <boost/thread.hpp>
 
 #if defined(NDEBUG)
 #error "Bitcoin cannot be compiled without assertions."
@@ -947,8 +947,9 @@
     safeStatus = singleQuote + safeStatus + singleQuote;
     boost::replace_all(strCmd, "%s", safeStatus);
 
+    std::thread t(runCommand, strCmd);
     // thread runs free
-    boost::thread t(runCommand, strCmd);
+    t.detach();
 }
 
 static void CheckForkWarningConditions() {
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -33,7 +33,6 @@
 #include "wallet/finaltx.h"
 
 #include <boost/algorithm/string/replace.hpp>
-#include <boost/thread.hpp>
 
 #include <cassert>
 
@@ -1081,8 +1080,9 @@
 
     if (!strCmd.empty()) {
         boost::replace_all(strCmd, "%s", wtxIn.GetId().GetHex());
+        std::thread t(runCommand, strCmd);
         // Thread runs free.
-        boost::thread t(runCommand, strCmd);
+        t.detach();
     }
 
     return true;