diff --git a/public/src/modules/translator.js b/public/src/modules/translator.js
index 2fd50d5703..30ec2e1979 100644
--- a/public/src/modules/translator.js
+++ b/public/src/modules/translator.js
@@ -286,6 +286,9 @@
 					var out = translated;
 					translatedArgs.forEach(function (arg, i) {
 						var escaped = arg.replace(/%(?=\d)/g, '%').replace(/\\,/g, ',');
+						// fix double escaped translation keys, see https://github.com/NodeBB/NodeBB/issues/9206
+						escaped = escaped.replace(/[/g, '[')
+							.replace(/]/g, ']');
 						out = out.replace(new RegExp('%' + (i + 1), 'g'), escaped);
 					});
 					return out;
diff --git a/test/translator.js b/test/translator.js
index 1776c06b9b..bd6d0f0fbb 100644
--- a/test/translator.js
+++ b/test/translator.js
@@ -135,6 +135,16 @@ describe('new Translator(language)', function () {
 			});
 		});
 
+		it('should translate escaped translation arguments properly', function () {
+			// https://github.com/NodeBB/NodeBB/issues/9206
+			var translator = Translator.create('en-GB');
+
+			var key = '[[notifications:upvoted_your_post_in, test1, error: Error: [[error:group-name-too-long]] on NodeBB Upgrade]]';
+			return translator.translate(key).then(function (translated) {
+				assert.strictEqual(translated, '<strong>test1</strong> has upvoted your post in <strong>error: Error: &lsqb;&lsqb;error:group-name-too-long&rsqb;&rsqb; on NodeBB Upgrade</strong>.');
+			});
+		});
+
 		it('should properly escape and ignore % and \\, in arguments', function () {
 			var translator = Translator.create('en-GB');