diff --git a/Templates/MSBuild/FlagTables/v142_CSharp.json b/Templates/MSBuild/FlagTables/v142_CSharp.json
index 9164849005..4dcea9de32 100644
--- a/Templates/MSBuild/FlagTables/v142_CSharp.json
+++ b/Templates/MSBuild/FlagTables/v142_CSharp.json
@@ -270,6 +270,17 @@
     "value": "",
     "flags": []
   },
+  {
+    "name":  "WarningsAsErrors",
+    "switch": "warnaserror:",
+    "comment": "",
+    "value": "",
+    "flags": [
+      "UserValue",
+      "UserRequired",
+      "CommaAppendable"
+    ]
+  },
   {
     "name":  "WarningLevel",
     "switch": "warn:0",