diff --git a/cli.js b/cli.js
index fd9c334..a01e653 100755
--- a/cli.js
+++ b/cli.js
@@ -1,6 +1,6 @@
 #!/usr/bin/env node
 var fs = require('fs')
-var args = require('minimist')(process.argv.slice(2), {boolean: ['prune', 'asar']})
+var args = require('minimist')(process.argv.slice(2), {boolean: ['prune', 'asar', 'overwrite']})
 var packager = require('./')
 var usage = fs.readFileSync(__dirname + '/usage.txt').toString()
 
diff --git a/linux.js b/linux.js
index 7622fa3..ca1afb6 100644
--- a/linux.js
+++ b/linux.js
@@ -2,6 +2,7 @@ var path = require('path')
 var fs = require('fs')
 var mkdirp = require('mkdirp')
 var ncp = require('ncp').ncp
+var rimraf = require('rimraf')
 var common = require('./common')
 
 module.exports = {
@@ -12,10 +13,25 @@ module.exports = {
     var finalBinary = path.join(finalDir, opts.name)
 
     function copyApp () {
-      mkdirp(finalDir, function AppFolderCreated (err) {
+      var createApp = function (err) {
         if (err) return cb(err)
-        copyAppTemplate()
-      })
+        mkdirp(finalDir, function AppFolderCreated (err) {
+          if (err) return cb(err)
+          copyAppTemplate()
+        })
+      }
+      if (opts.overwrite) {
+        fs.exists(finalDir, function (exists) {
+          if (exists) {
+            console.log('Overwriting existing ' + finalDir + ' ...')
+            rimraf(finalDir, createApp)
+          } else {
+            createApp()
+          }
+        })
+      } else {
+        createApp()
+      }
     }
 
     function copyAppTemplate () {
diff --git a/mac.js b/mac.js
index 4214324..9a9db15 100644
--- a/mac.js
+++ b/mac.js
@@ -80,24 +80,40 @@ function buildMacApp (opts, cb, newApp) {
 
       mkdirp(outdir, function mkoutdirp () {
         if (err) return cb(err)
-        mv(newApp, finalPath, function moved (err) {
+        if (opts.overwrite) {
+          fs.exists(finalPath, function (exists) {
+            if (exists) {
+              console.log('Overwriting existing ' + finalPath + ' ...')
+              rimraf(finalPath, deploy)
+            } else {
+              deploy()
+            }
+          })
+        } else {
+          deploy()
+        }
+        
+        function deploy (err) {
           if (err) return cb(err)
-          if (opts.asar) {
-            var finalPath = path.join(opts.out || process.cwd(), opts.name + '.app', 'Contents', 'Resources')
-            common.asarApp(finalPath, function (err) {
-              if (err) return cb(err)
+          mv(newApp, finalPath, function moved (err) {
+            if (err) return cb(err)
+            if (opts.asar) {
+              var finalPath = path.join(opts.out || process.cwd(), opts.name + '.app', 'Contents', 'Resources')
+              common.asarApp(finalPath, function (err) {
+                if (err) return cb(err)
+                updateMacIcon(function (err) {
+                  if (err) return cb(err)
+                  codesign()
+                })
+              })
+            } else {
               updateMacIcon(function (err) {
                 if (err) return cb(err)
                 codesign()
               })
-            })
-          } else {
-            updateMacIcon(function (err) {
-              if (err) return cb(err)
-              codesign()
-            })
-          }
-        })
+            }
+          })
+        }
       })
     }