diff --git a/third_party/dotnet/devtools/src/generator/ProtocolDefinition/ProtocolDefinitionItem.cs b/third_party/dotnet/devtools/src/generator/ProtocolDefinition/ProtocolDefinitionItem.cs
index c06efddae70b8..d2722a56f29ba 100644
--- a/third_party/dotnet/devtools/src/generator/ProtocolDefinition/ProtocolDefinitionItem.cs
+++ b/third_party/dotnet/devtools/src/generator/ProtocolDefinition/ProtocolDefinitionItem.cs
@@ -11,7 +11,10 @@ public abstract class ProtocolDefinitionItem : IDefinition
         [JsonIgnore]
         public string? Description
         {
-            get => InitialDescription?.Replace("<", "&lt;").Replace(">", "&gt;");
+            get => InitialDescription?
+                .Replace("&", "&amp;")
+                .Replace("<", "&lt;")
+                .Replace(">", "&gt;");
             set => InitialDescription = value;
         }