diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..c5b3792
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,4642 @@
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+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    },
+    "xtend": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
+      "integrity": "sha512-LKYU1iAXJXUgAXn9URjiu+MWhyUXHsvfp7mcuYm9dSUKK0/CjtrUwFAxD82/mCWbtLsGjFIad0wIsod4zrTAEQ==",
+      "dev": true
+    },
+    "yallist": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
+      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
+      "dev": true
+    }
+  }
+}
diff --git a/package.json b/package.json
index 1b4075e..2d0f8b3 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,5 @@
     "tap": "^5.7.1",
     "tap-only": "0.0.5"
   },
-  "dependencies": {
-    "debug": "^2.2.0"
-  }
+  "dependencies": {}
 }
diff --git a/test/misc.test.js b/test/misc.test.js
index b871f76..42c6d7c 100644
--- a/test/misc.test.js
+++ b/test/misc.test.js
@@ -1,7 +1,7 @@
 var test = require('tap').test;
 var undefsafe = require('../lib/undefsafe');
 
-test('cannot modify prototype chain', function(t) {
+test('cannot modify prototype chain', function (t) {
   const pre = {}.__proto__.toString;
   var payload = '__proto__.toString';
   undefsafe({ a: 'b' }, payload, 'JHU');
@@ -9,3 +9,12 @@ test('cannot modify prototype chain', function(t) {
   ({}.__proto__.toString = pre); // restore
   t.end();
 });
+
+test('cannot pollute prototype chain', function (t) {
+  global.polluted = 'nope';
+  undefsafe({}, '__proto__.polluted', true);
+  t.notEqual(global.polluted, true);
+  t.equal(global.polluted, 'nope');
+
+  t.end();
+});