diff --git a/scripts/package.sh b/scripts/package.sh
index 728bf3f9..2316dc65 100755
--- a/scripts/package.sh
+++ b/scripts/package.sh
@@ -1,12 +1,18 @@
 #!/usr/bin/env bash
 VERSION=`node -e 'process.stdout.write(require("./package").version)'`
+
+if [ -z "$HYPERTERM_OSX_SIGNING_IDENTITY" ]; then
+    echo "ENV var HYPERTERM_OSX_SIGNING_IDENTITY missing. Set it to the Common Name of the downloaded certificate from Apple."
+    exit 1
+fi
+
 rm -rf node_modules
 rm -rf ./app/node_modules
 rm -rf ./dist/HyperTerm-darwin-x64
 rm -rf ./dist/
 rm -rf ./build/
 mkdir build
-./install.sh
+./scripts/install.sh
 npm run lint
 cd app
 npm install
@@ -16,7 +22,7 @@ cd -
 cp app/index.html build/
 cp -r app/dist build/
 mkdir dist
-electron-packager ./ --platform=darwin --out=dist --arch=x64 --app-bundle-id="co.zeit.hyperterm" --app-version="$VERSION" --osx-sign --icon=static/icon.icns --prune --ignore=app/
+electron-packager ./ --platform=darwin --out=dist --arch=x64 --app-bundle-id="co.zeit.hyperterm" --app-version="$VERSION" --osx-sign.identity="$HYPERTERM_OSX_SIGNING_IDENTITY" --icon=static/icon.icns --prune --ignore=app/
 cd dist/HyperTerm-darwin-x64/
 zip -r -y ../hyperterm-macos-x64-$VERSION.zip .
 cd -