diff --git a/src/compiler/transformers/ts.ts b/src/compiler/transformers/ts.ts
index 52717a94996..6af8a263599 100644
--- a/src/compiler/transformers/ts.ts
+++ b/src/compiler/transformers/ts.ts
@@ -1905,7 +1905,7 @@ namespace ts {
                     : (<ComputedPropertyName>name).expression;
             }
             else if (isIdentifier(name)) {
-                return createLiteral(name.text);
+                return createLiteral(unescapeIdentifier(name.text));
             }
             else {
                 return getSynthesizedClone(name);
diff --git a/tests/baselines/reference/decoratorWithUnderscoreMethod.js b/tests/baselines/reference/decoratorWithUnderscoreMethod.js
index 03037980ee7..bf79890263b 100644
--- a/tests/baselines/reference/decoratorWithUnderscoreMethod.js
+++ b/tests/baselines/reference/decoratorWithUnderscoreMethod.js
@@ -34,4 +34,4 @@ var A = (function () {
 }());
 __decorate([
     dec()
-], A.prototype, "___foo");
+], A.prototype, "__foo");