diff --git a/lib/internal/url.js b/lib/internal/url.js
index cae4037b6e7792..1e31bc9ad873f2 100644
--- a/lib/internal/url.js
+++ b/lib/internal/url.js
@@ -805,7 +805,7 @@ const noEscape = [
 const paramHexTable = hexTable.slice();
 paramHexTable[0x20] = '+';
 
-function escapeParam(str) {
+function encodeStr(str, noEscapeTable, hexTable) {
   const len = str.length;
   if (len === 0)
     return '';
@@ -818,12 +818,12 @@ function escapeParam(str) {
 
     // ASCII
     if (c < 0x80) {
-      if (noEscape[c] === 1)
+      if (noEscapeTable[c] === 1)
         continue;
       if (lastPos < i)
         out += str.slice(lastPos, i);
       lastPos = i + 1;
-      out += paramHexTable[c];
+      out += hexTable[c];
       continue;
     }
 
@@ -833,15 +833,15 @@ function escapeParam(str) {
     // Multi-byte characters ...
     if (c < 0x800) {
       lastPos = i + 1;
-      out += paramHexTable[0xC0 | (c >> 6)] +
-             paramHexTable[0x80 | (c & 0x3F)];
+      out += hexTable[0xC0 | (c >> 6)] +
+             hexTable[0x80 | (c & 0x3F)];
       continue;
     }
     if (c < 0xD800 || c >= 0xE000) {
       lastPos = i + 1;
-      out += paramHexTable[0xE0 | (c >> 12)] +
-             paramHexTable[0x80 | ((c >> 6) & 0x3F)] +
-             paramHexTable[0x80 | (c & 0x3F)];
+      out += hexTable[0xE0 | (c >> 12)] +
+             hexTable[0x80 | ((c >> 6) & 0x3F)] +
+             hexTable[0x80 | (c & 0x3F)];
       continue;
     }
     // Surrogate pair
@@ -857,10 +857,10 @@ function escapeParam(str) {
     }
     lastPos = i + 1;
     c = 0x10000 + (((c & 0x3FF) << 10) | c2);
-    out += paramHexTable[0xF0 | (c >> 18)] +
-           paramHexTable[0x80 | ((c >> 12) & 0x3F)] +
-           paramHexTable[0x80 | ((c >> 6) & 0x3F)] +
-           paramHexTable[0x80 | (c & 0x3F)];
+    out += hexTable[0xF0 | (c >> 18)] +
+           hexTable[0x80 | ((c >> 12) & 0x3F)] +
+           hexTable[0x80 | ((c >> 6) & 0x3F)] +
+           hexTable[0x80 | (c & 0x3F)];
   }
   if (lastPos === 0)
     return str;
@@ -876,9 +876,17 @@ function serializeParams(array) {
   if (len === 0)
     return '';
 
-  var output = `${escapeParam(array[0])}=${escapeParam(array[1])}`;
-  for (var i = 2; i < len; i += 2)
-    output += `&${escapeParam(array[i])}=${escapeParam(array[i + 1])}`;
+  const firstEncodedParam = encodeStr(array[0], noEscape, paramHexTable);
+  const firstEncodedValue = encodeStr(array[1], noEscape, paramHexTable);
+  let output =
+    `${firstEncodedParam}=${firstEncodedValue}`;
+
+  for (var i = 2; i < len; i += 2) {
+    const encodedParam = encodeStr(array[i], noEscape, paramHexTable);
+    const encodedValue = encodeStr(array[i + 1], noEscape, paramHexTable);
+    output += `&${encodedParam}=${encodedValue}`;
+  }
+
   return output;
 }
 
@@ -1422,5 +1430,6 @@ module.exports = {
   domainToUnicode,
   urlToOptions,
   formatSymbol: kFormat,
-  searchParamsSymbol: searchParams
+  searchParamsSymbol: searchParams,
+  encodeStr
 };