diff --git a/appveyor.yml b/appveyor.yml
new file mode 100644
index 0000000..1084dcf
--- /dev/null
+++ b/appveyor.yml
@@ -0,0 +1,29 @@
+# Test against this version of Node.js
+environment:
+  matrix:
+    - nodejs_version: "4"
+    - nodejs_version: "5"
+    - nodejs_version: "6"
+
+platform:
+  - x86
+  - x64
+
+# Install scripts. (runs after repo cloning)
+install:
+  # Get the latest stable version of Node.js or io.js
+  - ps: Install-Product node $env:nodejs_version $env:platform
+  # install modules
+  - npm install
+
+# Post-install test scripts.
+test_script:
+  # Output useful info for debugging.
+  - node --version
+  - npm --version
+  # run tests
+  - npm run coverage
+
+# Don't actually build.
+build: off
+
diff --git a/package.json b/package.json
index a53637f..239355c 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
   },
   "homepage": "https://github.com/dwyl/terminate",
   "dependencies": {
-    "ps-tree": "1.0.1"
+    "ps-tree": "^1.1.0"
   },
   "devDependencies": {
     "chalk": "^1.1.1",
diff --git a/terminate.js b/terminate.js
index 1c86c36..58f4b04 100644
--- a/terminate.js
+++ b/terminate.js
@@ -1,4 +1,3 @@
-var cp = require('child_process');
 var psTree = require('ps-tree'); // see: http://git.io/jBHZ
 
 /**
@@ -17,13 +16,22 @@ module.exports = function terminate(pid, callback) {
     throw new Error("No pid supplied to Terminate!")
   }
   psTree(pid, function (err, children) {
-    cp.spawn('kill', ['-9'].concat(children.map(function (p) { return p.PID })))
-      .on('exit', function() {
-        if(callback && typeof callback === 'function') {
-          callback(err, true);
-        } else { // do nothing
-          console.log(children.length + " Processes Terminated!");
-        }
-      });
+    children.forEach(function (child) {
+      try {
+        process.kill(parseInt(child.PID), 'SIGKILL');
+      } catch (error) {
+        // ignore
+      }
+    });
+    try {
+      process.kill(pid, 'SIGKILL');
+    } catch (error) {
+      // ignore
+    }
+    if(callback && typeof callback === 'function') {
+      callback(err, true);
+    } else { // do nothing
+      console.log(children.length + " Processes Terminated!");
+    }
   });
 };
diff --git a/test/exec/child.js b/test/exec/child.js
index 0f5b84d..42e21b8 100644
--- a/test/exec/child.js
+++ b/test/exec/child.js
@@ -1,3 +1,5 @@
 // does nothing child process
 console.log("Child process.id: "+process.pid);
 console.log(" - - - - - - - - - - - - - - - - - - - - - - - ");
+// keep process alive for one minute
+setTimeout(function () {}, 60000);
diff --git a/test/test.js b/test/test.js
index 5f5c66d..3c02185 100644
--- a/test/test.js
+++ b/test/test.js
@@ -33,7 +33,7 @@ test(cyan('Spawn a Parent process which has a few Child Processes'), function (t
           t.equal(children.length, 0, green("✓ No more active child processes (we killed them)"));
           t.end();
         })
-      },200); // give psTree time to kill the processes
+      },1000); // give psTree time to kill the processes
     },10); // give the child process time to spawn
   },200); // give the child process time to spawn
 });