diff --git a/.travis.yml b/.travis.yml
index 0e0d6686d95..6d7be5f7e10 100755
--- a/.travis.yml
+++ b/.travis.yml
@@ -26,7 +26,7 @@ addons:
 before_install:
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew update ; fi
   - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install gnu-tar dpkg libicns graphicsmagick git-lfs; fi
-  - git lfs pull
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then git lfs pull; fi
   - gem install --no-rdoc --no-ri fpm
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then curl -L https://github.com/github/git-lfs/releases/download/v1.1.2/git-lfs-linux-amd64-1.1.2.tar.gz | tar -xz; fi
   - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then git-lfs-1.1.2/git-lfs pull; fi
diff --git a/package.json b/package.json
index 4f37092b9fa..7479e7eedff 100644
--- a/package.json
+++ b/package.json
@@ -67,11 +67,11 @@
     "progress-stream": "^1.2.0",
     "read-package-json": "^2.0.3",
     "source-map-support": "^0.4.0",
-    "tmp": "0.0.28"
+    "tmp": "0.0.28",
+    "7zip-bin": "0.0.2"
   },
   "optionalDependencies": {
-    "appdmg": "^0.3.6",
-    "7zip-bin": "0.0.2"
+    "appdmg": "^0.3.6"
   },
   "devDependencies": {
     "ava-tf": "^0.12.4-beta.6",
diff --git a/src/util.ts b/src/util.ts
index 86bec49a3a9..33fe8d273c6 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -35,7 +35,7 @@ export function installDependencies(appDir: string, electronVersion: string, arc
   let npmExecPath = process.env.npm_execpath || process.env.NPM_CLI_JS
   const npmExecArgs = [command, "--production"]
   if (npmExecPath == null) {
-    npmExecPath = "npm"
+    npmExecPath = process.platform === "win32" ? "npm.cmd" : "npm"
   }
   else {
     npmExecArgs.unshift(npmExecPath)