diff --git a/src/Microsoft.OpenApi/Services/OpenApiWalker.cs b/src/Microsoft.OpenApi/Services/OpenApiWalker.cs
index a1b91985c..dd3c09564 100644
--- a/src/Microsoft.OpenApi/Services/OpenApiWalker.cs
+++ b/src/Microsoft.OpenApi/Services/OpenApiWalker.cs
@@ -771,6 +771,11 @@ internal void Walk(OpenApiSchema schema, bool isComponent = false)
                 Walk("anyOf", () => Walk(schema.AnyOf));
             }
 
+            if (schema.OneOf != null)
+            {
+                Walk("oneOf", () => Walk(schema.OneOf));
+            }
+
             if (schema.Properties != null)
             {
                 Walk("properties", () =>