diff --git a/lib/registry.js b/lib/registry.js
index 9ba0194f..a07c68f2 100644
--- a/lib/registry.js
+++ b/lib/registry.js
@@ -2,6 +2,22 @@
 
 const { getValueAsString } = require('./util');
 
+const ESCAPE_STRING_REPLACE_MAP = {
+	'\\': '\\\\',
+	'\n': '\\n',
+};
+
+const ESCAPE_LABEL_VALUE_REPLACE_MAP = {
+	...ESCAPE_STRING_REPLACE_MAP,
+	'"': '\\\\"',
+};
+
+const ESCAPE_REPLACE_REGEXP = /\\|\n|"/g;
+
+function REPLACE_FUNC(dict) {
+	return char => dict[char] || '';
+}
+
 class Registry {
 	static get PROMETHEUS_CONTENT_TYPE() {
 		return 'text/plain; version=0.0.4; charset=utf-8';
@@ -234,10 +250,15 @@ function escapeLabelValue(str) {
 	if (typeof str !== 'string') {
 		return str;
 	}
-	return escapeString(str).replace(/"/g, '\\"');
+
+	return escapeString(str, ESCAPE_LABEL_VALUE_REPLACE_MAP);
 }
-function escapeString(str) {
-	return str.replace(/\\/g, '\\\\').replace(/\n/g, '\\n');
+function escapeString(str, extraReplaceDict) {
+	const fullDict = extraReplaceDict
+		? extraReplaceDict
+		: ESCAPE_STRING_REPLACE_MAP;
+
+	return str.replace(ESCAPE_REPLACE_REGEXP, REPLACE_FUNC(fullDict));
 }
 function standardizeCounterName(name) {
 	return name.replace(/_total$/, '');