diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8383615c299..44d3fb4f2a1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -76,6 +76,11 @@
 
 [package spec proposal]: https://github.com/lrhn/dep-pkgspec
 
+### VM Service Protocol Changes
+
+* Some RPCs that didn't include a `"jsonrpc"` property in their responses now
+  include one.
+
 ## 1.11.2
 
 ### Core library changes
diff --git a/runtime/vm/service/message.dart b/runtime/vm/service/message.dart
index 631f0a7673a..d54cb4c338f 100644
--- a/runtime/vm/service/message.dart
+++ b/runtime/vm/service/message.dart
@@ -143,6 +143,7 @@ class Message {
 
   void setErrorResponse(String message) {
     var response = {
+      'jsonrpc': '2.0',
       'id': serial,
       'result' : {
         'type': 'Error',
diff --git a/runtime/vm/service/vmservice.dart b/runtime/vm/service/vmservice.dart
index e6889bbbe01..7d5217ce792 100644
--- a/runtime/vm/service/vmservice.dart
+++ b/runtime/vm/service/vmservice.dart
@@ -156,6 +156,7 @@ class VMService extends MessageRouter {
 
   String _encodeError(Message message, int code, {String details}) {
     var response = {
+      'jsonrpc': '2.0',
       'id' : message.serial,
       'error' : {
         'code': code,
@@ -172,6 +173,7 @@ class VMService extends MessageRouter {
 
   String _encodeResult(Message message, Map result) {
     var response = {
+      'jsonrpc': '2.0',
       'id' : message.serial,
       'result' : result,
     };