diff --git a/source/util.js b/source/util.js
index d617156..ca466fd 100644
--- a/source/util.js
+++ b/source/util.js
@@ -10,7 +10,7 @@ const stringReplaceAll = (string, substring, replacer) => {
 	let endIndex = 0;
 	let returnValue = '';
 	do {
-		returnValue += string.substr(endIndex, index - endIndex) + replacer;
+		returnValue += string.substr(endIndex, index - endIndex) + substring + replacer;
 		endIndex = index + substringLength;
 		index = string.indexOf(substring, endIndex);
 	} while (index !== -1);
diff --git a/test/chalk.js b/test/chalk.js
index 008a128..2992a09 100644
--- a/test/chalk.js
+++ b/test/chalk.js
@@ -37,7 +37,7 @@ test('support nesting styles', t => {
 test('support nesting styles of the same type (color, underline, bg)', t => {
 	t.is(
 		chalk.red('a' + chalk.yellow('b' + chalk.green('c') + 'b') + 'c'),
-		'\u001B[31ma\u001B[33mb\u001B[32mc\u001B[33mb\u001B[31mc\u001B[39m'
+		'\u001B[31ma\u001B[33mb\u001B[32mc\u001B[39m\u001B[31m\u001B[33mb\u001B[39m\u001B[31mc\u001B[39m'
 	);
 });