diff --git a/packages/babel-helper-create-regexp-features-plugin/src/features.ts b/packages/babel-helper-create-regexp-features-plugin/src/features.ts
index 4624d6cbcce2..f190fb84b189 100644
--- a/packages/babel-helper-create-regexp-features-plugin/src/features.ts
+++ b/packages/babel-helper-create-regexp-features-plugin/src/features.ts
@@ -3,6 +3,7 @@ export const FEATURES = Object.freeze({
   dotAllFlag: 1 << 1,
   unicodePropertyEscape: 1 << 2,
   namedCaptureGroups: 1 << 3,
+  // Babel 8.1: remove unicodeSetsFlag_syntax
   unicodeSetsFlag_syntax: 1 << 4,
   unicodeSetsFlag: 1 << 5,
   duplicateNamedCaptureGroups: 1 << 6,
diff --git a/packages/babel-helper-create-regexp-features-plugin/src/util.ts b/packages/babel-helper-create-regexp-features-plugin/src/util.ts
index 7396baf3219a..94a00cc66365 100644
--- a/packages/babel-helper-create-regexp-features-plugin/src/util.ts
+++ b/packages/babel-helper-create-regexp-features-plugin/src/util.ts
@@ -33,9 +33,7 @@ export function generateRegexpuOptions(
 
   return {
     unicodeFlag: feat("unicodeFlag"),
-    unicodeSetsFlag:
-      feat<Experimental>("unicodeSetsFlag") ||
-      feat<Experimental>("unicodeSetsFlag_syntax", "parse"),
+    unicodeSetsFlag: feat<Experimental>("unicodeSetsFlag") || "parse",
     dotAllFlag: feat("dotAllFlag"),
     unicodePropertyEscapes: feat("unicodePropertyEscape"),
     namedGroups: feat("namedCaptureGroups") || featDuplicateNamedGroups(),