diff --git a/lib/monitor/run.js b/lib/monitor/run.js
index ab890ec9..9815af49 100644
--- a/lib/monitor/run.js
+++ b/lib/monitor/run.js
@@ -13,6 +13,7 @@ var noop = function () { };
 var restart = null;
 var psTree = require('@remy/pstree');
 var path = require('path');
+var signals = require('./signals');
 
 function run(options) {
   var cmd = config.command.raw;
@@ -290,9 +291,13 @@ function kill(child, signal, callback) {
     // configured signal (default: SIGUSR2) signal, which fixes #335
     // note that psTree also works if `ps` is missing by looking in /proc
     psTree(child.pid, function (err, kids) {
-      spawn('kill', ['-s', signal, child.pid].concat(kids.map(function (p) {
-        return p.PID;
-      }))).on('close', callback);
+      // make sure we kill from smallest to largest
+      const pids = kids.map(p => p.PID).concat(child.pid).sort();
+
+      pids.forEach(pid => {
+        exec('kill -' + signals[signal] + ' ' + pid, () => {});
+      });
+      callback();
     });
   }
 }
diff --git a/lib/monitor/signals.js b/lib/monitor/signals.js
new file mode 100644
index 00000000..c54d2e02
--- /dev/null
+++ b/lib/monitor/signals.js
@@ -0,0 +1,34 @@
+module.exports = {
+  "SIGHUP": "1",
+  "SIGINT": "2",
+  "SIGQUIT": "3",
+  "SIGILL": "4",
+  "SIGTRAP": "5",
+  "SIGABRT": "6",
+  "SIGBUS": "7",
+  "SIGFPE": "8",
+  "SIGKILL": "9",
+  "SIGUSR1": "10",
+  "SIGSEGV": "11",
+  "SIGUSR2": "12",
+  "SIGPIPE": "13",
+  "SIGALRM": "14",
+  "SIGTERM": "15",
+  "SIGSTKFLT": "16",
+  "SIGCHLD": "17",
+  "SIGCONT": "18",
+  "SIGSTOP": "19",
+  "SIGTSTP": "20",
+  "SIGTTIN": "21",
+  "SIGTTOU": "22",
+  "SIGURG": "23",
+  "SIGXCPU": "24",
+  "SIGXFSZ": "25",
+  "SIGVTALRM": "26",
+  "SIGPROF": "27",
+  "SIGWINCH": "28",
+  "SIGIO": "29",
+  "SIGPWR": "30",
+  "SIGSYS": "31",
+  "SIGRTMIN": "35"
+}