diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
index be96d3de07d..03d0170ec61 100644
--- a/src/compiler/diagnosticMessages.json
+++ b/src/compiler/diagnosticMessages.json
@@ -2024,6 +2024,10 @@
         "category": "Error",
         "code": 2570
     },
+    "Object is of type 'unknown'.": {
+        "category": "Error",
+        "code": 2571
+    },
     "JSX element attributes type '{0}' may not be a union type.": {
         "category": "Error",
         "code": 2600