diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
index 034bd27b1472a..035a034b7270c 100644
--- a/src/compiler/diagnosticMessages.json
+++ b/src/compiler/diagnosticMessages.json
@@ -627,11 +627,11 @@
         "category": "Error",
         "code": 1200
     },
-    "Import assignment cannot be used when targeting ECMAScript 6 modules. Consider using 'import * as ns from \"mod\"', 'import {a} from \"mod\"', 'import d from \"mod\"', or another module format instead.": {
+    "Import assignment cannot be used when targeting ECMAScript 2015 modules. Consider using 'import * as ns from \"mod\"', 'import {a} from \"mod\"', 'import d from \"mod\"', or another module format instead.": {
         "category": "Error",
         "code": 1202
     },
-    "Export assignment cannot be used when targeting ECMAScript 6 modules. Consider using 'export default' or another module format instead.": {
+    "Export assignment cannot be used when targeting ECMAScript 2015 modules. Consider using 'export default' or another module format instead.": {
         "category": "Error",
         "code": 1203
     },
@@ -687,7 +687,7 @@
         "category": "Error",
         "code": 1219
     },
-    "Generators are only available when targeting ECMAScript 6 or higher.": {
+    "Generators are only available when targeting ECMAScript 2015 or higher.": {
         "category": "Error",
         "code": 1220
     },
@@ -831,7 +831,7 @@
         "category": "Error",
         "code": 1308
     },
-    "Async functions are only available when targeting ECMAScript 6 and higher.": {
+    "Async functions are only available when targeting ECMAScript 2015 or higher.": {
         "category": "Error",
         "code": 1311
     },