diff --git a/src/babel/transformation/helpers/regex.js b/src/babel/transformation/helpers/regex.js
index 9251fdb823..1d3d4c2a4c 100644
--- a/src/babel/transformation/helpers/regex.js
+++ b/src/babel/transformation/helpers/regex.js
@@ -7,7 +7,7 @@ export function is(node, flag) {
 
 export function pullFlag(node, flag) {
   var flags = node.regex.flags.split("");
-  if (node.regex.flags.indexOf("u") < 0) return;
-  pull(flags, "u");
+  if (node.regex.flags.indexOf(flag) < 0) return;
+  pull(flags, flag);
   node.regex.flags = flags.join("");
 }
diff --git a/src/babel/transformation/transformers/es6/regex.unicode.js b/src/babel/transformation/transformers/es6/regex.unicode.js
index 2cf7717c7e..9bcc0ab8be 100644
--- a/src/babel/transformation/transformers/es6/regex.unicode.js
+++ b/src/babel/transformation/transformers/es6/regex.unicode.js
@@ -7,6 +7,6 @@ export function check(node) {
 
 export function Literal(node) {
   if (!regex.is(node, "u")) return;
-  regex.pullFlag(node, "y");
+  regex.pullFlag(node, "u");
   node.regex.pattern = rewritePattern(node.regex.pattern, node.regex.flags);
 }