diff --git a/package.json b/package.json
index 1d2a3948..b086fac9 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
   },
   "scripts": {
     "start": "./node_modules/.bin/webpack-dev-server --inline --host 127.0.0.1 --content-base examples/",
-    "test": "NODE_ENV=test karma start"
+    "test": "cross-env NODE_ENV=test karma start"
   },
   "authors": [
     "Ryan Florence"
@@ -25,6 +25,7 @@
     "babel-loader": "^6.2.4",
     "babel-preset-es2015": "^6.6.0",
     "babel-preset-react": "^6.5.0",
+    "cross-env": "^5.0.1",
     "envify": "^3.4.1",
     "expect": "^1.20.2",
     "gitbook-cli": "^2.3.0",
diff --git a/yarn.lock b/yarn.lock
index 6df1feec..b27c6c24 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1,5 +1,7 @@
 # THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
 # yarn lockfile v1
+
+
 abbrev@1, abbrev@~1.0.7, abbrev@~1.0.9:
   version "1.0.9"
   resolved "https://registry.yarnpkg.com/abbrev/-/abbrev-1.0.9.tgz#91b4792588a7738c25f35dd6f63752a2f8776135"
@@ -1092,6 +1094,13 @@ create-react-class@^15.5.2:
     fbjs "^0.8.9"
     object-assign "^4.1.1"
 
+cross-env@^5.0.1:
+  version "5.0.1"
+  resolved "https://registry.yarnpkg.com/cross-env/-/cross-env-5.0.1.tgz#ff4e72ea43b47da2486b43a7f2043b2609e44913"
+  dependencies:
+    cross-spawn "^5.1.0"
+    is-windows "^1.0.0"
+
 cross-spawn@^4.0.0:
   version "4.0.2"
   resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-4.0.2.tgz#7b9247621c23adfdd3856004a823cbe397424d41"
@@ -1099,6 +1108,14 @@ cross-spawn@^4.0.0:
     lru-cache "^4.0.1"
     which "^1.2.9"
 
+cross-spawn@^5.1.0:
+  version "5.1.0"
+  resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-5.1.0.tgz#e8bd0efee58fcff6f8f94510a0a554bbfa235449"
+  dependencies:
+    lru-cache "^4.0.1"
+    shebang-command "^1.2.0"
+    which "^1.2.9"
+
 cryptiles@2.x.x:
   version "2.0.5"
   resolved "https://registry.yarnpkg.com/cryptiles/-/cryptiles-2.0.5.tgz#3bdfecdc608147c1c67202fa291e7dca59eaa3b8"
@@ -2224,6 +2241,10 @@ is-utf8@^0.2.0:
   version "0.2.1"
   resolved "https://registry.yarnpkg.com/is-utf8/-/is-utf8-0.2.1.tgz#4b0da1442104d1b336340e80797e865cf39f7d72"
 
+is-windows@^1.0.0:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/is-windows/-/is-windows-1.0.1.tgz#310db70f742d259a16a369202b51af84233310d9"
+
 isarray@0.0.1:
   version "0.0.1"
   resolved "https://registry.yarnpkg.com/isarray/-/isarray-0.0.1.tgz#8a18acfca9a8f4177e09abfc6038939b05d1eedf"
@@ -3983,6 +4004,16 @@ sha@~2.0.1:
     graceful-fs "^4.1.2"
     readable-stream "^2.0.2"
 
+shebang-command@^1.2.0:
+  version "1.2.0"
+  resolved "https://registry.yarnpkg.com/shebang-command/-/shebang-command-1.2.0.tgz#44aac65b695b03398968c39f363fee5deafdf1ea"
+  dependencies:
+    shebang-regex "^1.0.0"
+
+shebang-regex@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/shebang-regex/-/shebang-regex-1.0.0.tgz#da42f49740c0b42db2ca9728571cb190c98efea3"
+
 shell-quote@^1.6.1:
   version "1.6.1"
   resolved "https://registry.yarnpkg.com/shell-quote/-/shell-quote-1.6.1.tgz#f4781949cce402697127430ea3b3c5476f481767"
@@ -4680,4 +4711,3 @@ yargs@~3.5.4:
 yeast@0.1.2:
   version "0.1.2"
   resolved "https://registry.yarnpkg.com/yeast/-/yeast-0.1.2.tgz#008e06d8094320c372dbc2f8ed76a0ca6c8ac419"
-