diff --git a/lib/parse.js b/lib/parse.js
index 23f1677e..3a0e185f 100644
--- a/lib/parse.js
+++ b/lib/parse.js
@@ -26,11 +26,11 @@ var parseValues = function parseQueryStringValues(str, options) {
 
         var key, val;
         if (pos === -1) {
-            key = options.decoder(part);
+            key = options.decoder(part, defaults.decoder);
             val = options.strictNullHandling ? null : '';
         } else {
-            key = options.decoder(part.slice(0, pos));
-            val = options.decoder(part.slice(pos + 1));
+            key = options.decoder(part.slice(0, pos), defaults.decoder);
+            val = options.decoder(part.slice(pos + 1), defaults.decoder);
         }
         if (has.call(obj, key)) {
             obj[key] = [].concat(obj[key]).concat(val);
diff --git a/lib/stringify.js b/lib/stringify.js
index cbac7069..8fbbe4ba 100644
--- a/lib/stringify.js
+++ b/lib/stringify.js
@@ -50,7 +50,7 @@ var stringify = function stringify( // eslint-disable-line func-name-matching
         obj = serializeDate(obj);
     } else if (obj === null) {
         if (strictNullHandling) {
-            return encoder && !encodeValuesOnly ? encoder(prefix) : prefix;
+            return encoder && !encodeValuesOnly ? encoder(prefix, defaults.encoder) : prefix;
         }
 
         obj = '';
@@ -58,8 +58,8 @@ var stringify = function stringify( // eslint-disable-line func-name-matching
 
     if (typeof obj === 'string' || typeof obj === 'number' || typeof obj === 'boolean' || utils.isBuffer(obj)) {
         if (encoder) {
-            var keyValue = encodeValuesOnly ? prefix : encoder(prefix);
-            return [formatter(keyValue) + '=' + formatter(encoder(obj))];
+            var keyValue = encodeValuesOnly ? prefix : encoder(prefix, defaults.encoder);
+            return [formatter(keyValue) + '=' + formatter(encoder(obj, defaults.encoder))];
         }
         return [formatter(prefix) + '=' + formatter(String(obj))];
     }
diff --git a/test/parse.js b/test/parse.js
index c8093e97..a92ea15c 100644
--- a/test/parse.js
+++ b/test/parse.js
@@ -2,6 +2,7 @@
 
 var test = require('tape');
 var qs = require('../');
+var utils = require('../lib/utils');
 var iconv = require('iconv-lite');
 
 test('parse()', function (t) {
@@ -510,6 +511,16 @@ test('parse()', function (t) {
         st.end();
     });
 
+    t.test('receives the default decoder as a second argument', function (st) {
+        st.plan(1);
+        qs.parse('a', {
+            decoder: function (str, defaultDecoder) {
+                st.equal(defaultDecoder, utils.decode);
+            }
+        });
+        st.end();
+    });
+
     t.test('throws error with wrong decoder', function (st) {
         st.throws(function () {
             qs.parse({}, { decoder: 'string' });
@@ -523,4 +534,6 @@ test('parse()', function (t) {
         st.deepEqual(options, {});
         st.end();
     });
+
+    t.end();
 });
diff --git a/test/stringify.js b/test/stringify.js
index 168359c5..b06446c8 100644
--- a/test/stringify.js
+++ b/test/stringify.js
@@ -2,6 +2,7 @@
 
 var test = require('tape');
 var qs = require('../');
+var utils = require('../lib/utils');
 var iconv = require('iconv-lite');
 
 test('stringify()', function (t) {
@@ -452,6 +453,16 @@ test('stringify()', function (t) {
         st.end();
     });
 
+    t.test('receives the default encoder as a second argument', function (st) {
+        st.plan(2);
+        qs.stringify({ a: 1 }, {
+            encoder: function (str, defaultEncoder) {
+                st.equal(defaultEncoder, utils.encode);
+            }
+        });
+        st.end();
+    });
+
     t.test('throws error with wrong encoder', function (st) {
         st.throws(function () {
             qs.stringify({}, { encoder: 'string' });
@@ -570,4 +581,6 @@ test('stringify()', function (t) {
         st.deepEqual(options, {});
         st.end();
     });
+
+    t.end();
 });