diff --git a/src/main/java/io/vertx/openapi/validation/Parameter.java b/src/main/java/io/vertx/openapi/validation/Parameter.java
index a34985d..ebcbb2a 100644
--- a/src/main/java/io/vertx/openapi/validation/Parameter.java
+++ b/src/main/java/io/vertx/openapi/validation/Parameter.java
@@ -14,10 +14,12 @@
 
 import io.vertx.codegen.annotations.CacheReturn;
 import io.vertx.codegen.annotations.Nullable;
+import io.vertx.codegen.annotations.VertxGen;
 import io.vertx.core.buffer.Buffer;
 import io.vertx.core.json.JsonArray;
 import io.vertx.core.json.JsonObject;
 
+@VertxGen(concrete = false)
 public interface Parameter {
   /**
    * @return null if value is not a {@link String}, otherwise it returns value