diff --git a/src/index.js b/src/index.js
index ae3db0d..5eea7c8 100644
--- a/src/index.js
+++ b/src/index.js
@@ -16,7 +16,7 @@ import 'string.fromcodepoint';
  *   \U([0-9A-Fa-f]+) - sixth alternative; matches the 8-digit hexadecimal escape sequence used by python (\U0001F3B5)
  * )
  */
-const jsEscapeRegex = /\\(u\{([0-9A-Fa-f]+)\}|u([0-9A-Fa-f]{4})|x([0-9A-Fa-f]{2})|([1-7][0-7]{0,2}|[0-7]{2,3})|(['"tbrnfv0\\]))|\U([0-9A-Fa-f]{8})/g;
+const jsEscapeRegex = /\\(u\{([0-9A-Fa-f]+)\}|u([0-9A-Fa-f]{4})|x([0-9A-Fa-f]{2})|([1-7][0-7]{0,2}|[0-7]{2,3})|(['"tbrnfv0\\]))|\\U([0-9A-Fa-f]{8})/g;
 
 const usualEscapeSequences = {
     '0': '\0',
diff --git a/test/index.js b/test/index.js
index 017324c..c854df1 100644
--- a/test/index.js
+++ b/test/index.js
@@ -41,6 +41,6 @@ test('avoids double unescape cascade', t => {
 });
 
 test('python hex escape sequences', t => {
-    t.is(unescapeJs('---\U000000A9---'), '---\u00A9---');
-    t.is(unescapeJs('---\U0001F3B5---'), '---\uD83C\uDFB5---');
+    t.is(unescapeJs('---\\U000000A9---'), '---\u00A9---');
+    t.is(unescapeJs('---\\U0001F3B5---'), '---\uD83C\uDFB5---');
 });