diff --git a/index.js b/index.js
index dd6d479..ed9db4e 100644
--- a/index.js
+++ b/index.js
@@ -109,7 +109,7 @@ function JSONCookies (obj) {
     key = cookies[i]
     val = JSONCookie(obj[key])
 
-    if (val) {
+    if (val !== undefined) {
       obj[key] = val
     }
   }
diff --git a/test/cookieParser.js b/test/cookieParser.js
index 6031823..ab42aa9 100644
--- a/test/cookieParser.js
+++ b/test/cookieParser.js
@@ -162,6 +162,21 @@ describe('cookieParser.JSONCookie(str)', function () {
   })
 })
 
+describe('cookieParser.JSONCookies(obj)', function () {
+  it('should parse JSON cookie values, including falsy ones', function () {
+    assert.deepEqual(cookieParser.JSONCookies({
+      f: 'j:false',
+      z: 'j:0',
+      e: 'j:""',
+      n: 'j:null'
+    }), { f: false, z: 0, e: '', n: null })
+  })
+
+  it('should leave non-JSON cookie values untouched', function () {
+    assert.deepEqual(cookieParser.JSONCookies({ a: 'bar', b: 'j:{foo:"bar"}' }), { a: 'bar', b: 'j:{foo:"bar"}' })
+  })
+})
+
 describe('cookieParser.signedCookie(str, secret)', function () {
   it('should return undefined for non-string arguments', function () {
     assert.strictEqual(cookieParser.signedCookie(undefined, 'keyboard cat'), undefined)