diff --git a/test/language/comments/mongolian-vowel-separator-multi.js b/test/language/comments/mongolian-vowel-separator-multi.js
index 70a52708d0..7ec770e150 100644
--- a/test/language/comments/mongolian-vowel-separator-multi.js
+++ b/test/language/comments/mongolian-vowel-separator-multi.js
@@ -16,6 +16,7 @@ info: >
   It is useful to allow format-control characters in source text to facilitate
   editing and display. All format control characters may be used within comments,
   and within string literals, template literals, and regular expression literals.
+features: [u180e]
 ---*/
 
 // U+180E in comments; UTF8(0x180E) = 0xE1 0xA0 0x8E
diff --git a/test/language/comments/mongolian-vowel-separator-single.js b/test/language/comments/mongolian-vowel-separator-single.js
index c1704522bf..b0b329bc46 100644
--- a/test/language/comments/mongolian-vowel-separator-single.js
+++ b/test/language/comments/mongolian-vowel-separator-single.js
@@ -16,6 +16,7 @@ info: >
   It is useful to allow format-control characters in source text to facilitate
   editing and display. All format control characters may be used within comments,
   and within string literals, template literals, and regular expression literals.
+features: [u180e]
 ---*/
 
 // U+180E in comments; UTF8(0x180E) = 0xE1 0xA0 0x8E
diff --git a/test/language/white-space/mongolian-vowel-separator.js b/test/language/white-space/mongolian-vowel-separator.js
index f4b897559d..b7af7d2e72 100644
--- a/test/language/white-space/mongolian-vowel-separator.js
+++ b/test/language/white-space/mongolian-vowel-separator.js
@@ -23,6 +23,7 @@ info: >
 negative:
   phase: early
   type: SyntaxError
+features: [u180e]
 ---*/
 
 throw "Test262: This statement should not be evaluated.";