diff --git a/lib/stringify.js b/lib/stringify.js
index 997d3eec..5e17343e 100644
--- a/lib/stringify.js
+++ b/lib/stringify.js
@@ -30,6 +30,7 @@ var defaultFormat = formats['default'];
 var defaults = {
     addQueryPrefix: false,
     allowDots: false,
+    arrayFormat: 'indices',
     charset: 'utf-8',
     charsetSentinel: false,
     delimiter: '&',
@@ -213,11 +214,26 @@ var normalizeStringifyOptions = function normalizeStringifyOptions(opts) {
         filter = opts.filter;
     }
 
+    var arrayFormat;
+    if (opts.arrayFormat in arrayPrefixGenerators) {
+        arrayFormat = opts.arrayFormat;
+    } else if ('indices' in opts) {
+        arrayFormat = opts.indices ? 'indices' : 'repeat';
+    } else {
+        arrayFormat = defaults.arrayFormat;
+    }
+
+    if ('commaRoundTrip' in opts && typeof opts.commaRoundTrip !== 'boolean') {
+        throw new TypeError('`commaRoundTrip` must be a boolean, or absent');
+    }
+
     return {
         addQueryPrefix: typeof opts.addQueryPrefix === 'boolean' ? opts.addQueryPrefix : defaults.addQueryPrefix,
         allowDots: typeof opts.allowDots === 'undefined' ? defaults.allowDots : !!opts.allowDots,
+        arrayFormat: arrayFormat,
         charset: charset,
         charsetSentinel: typeof opts.charsetSentinel === 'boolean' ? opts.charsetSentinel : defaults.charsetSentinel,
+        commaRoundTrip: opts.commaRoundTrip,
         delimiter: typeof opts.delimiter === 'undefined' ? defaults.delimiter : opts.delimiter,
         encode: typeof opts.encode === 'boolean' ? opts.encode : defaults.encode,
         encoder: typeof opts.encoder === 'function' ? opts.encoder : defaults.encoder,
@@ -253,20 +269,8 @@ module.exports = function (object, opts) {
         return '';
     }
 
-    var arrayFormat;
-    if (opts && opts.arrayFormat in arrayPrefixGenerators) {
-        arrayFormat = opts.arrayFormat;
-    } else if (opts && 'indices' in opts) {
-        arrayFormat = opts.indices ? 'indices' : 'repeat';
-    } else {
-        arrayFormat = 'indices';
-    }
-
-    var generateArrayPrefix = arrayPrefixGenerators[arrayFormat];
-    if (opts && 'commaRoundTrip' in opts && typeof opts.commaRoundTrip !== 'boolean') {
-        throw new TypeError('`commaRoundTrip` must be a boolean, or absent');
-    }
-    var commaRoundTrip = generateArrayPrefix === 'comma' && opts && opts.commaRoundTrip;
+    var generateArrayPrefix = arrayPrefixGenerators[options.arrayFormat];
+    var commaRoundTrip = generateArrayPrefix === 'comma' && options.commaRoundTrip;
 
     if (!objKeys) {
         objKeys = Object.keys(obj);