diff --git a/extensions/resteasy-reactive/quarkus-resteasy-reactive-kotlin-serialization/runtime/src/main/kotlin/io/quarkus/kotlin/serialization/KotlinSerializationMessageBodyReader.kt b/extensions/resteasy-reactive/quarkus-resteasy-reactive-kotlin-serialization/runtime/src/main/kotlin/io/quarkus/kotlin/serialization/KotlinSerializationMessageBodyReader.kt
index 14096462b0d2d..b5a99f7892b61 100644
--- a/extensions/resteasy-reactive/quarkus-resteasy-reactive-kotlin-serialization/runtime/src/main/kotlin/io/quarkus/kotlin/serialization/KotlinSerializationMessageBodyReader.kt
+++ b/extensions/resteasy-reactive/quarkus-resteasy-reactive-kotlin-serialization/runtime/src/main/kotlin/io/quarkus/kotlin/serialization/KotlinSerializationMessageBodyReader.kt
@@ -16,7 +16,7 @@ import javax.ws.rs.core.MediaType
 import javax.ws.rs.core.MultivaluedMap
 
 class KotlinSerializationMessageBodyReader(private val json: Json) : AbstractJsonMessageBodyReader(), ServerMessageBodyReader<Any> {
-    override fun isReadable(type: Class<*>, genericType: Type, annotations: Array<Annotation>, mediaType: MediaType) =
+    override fun isReadable(type: Class<*>, genericType: Type, annotations: Array<Annotation>?, mediaType: MediaType) =
         isReadable(mediaType, type)
 
     override fun isReadable(type: Class<*>, genericType: Type, lazyMethod: ResteasyReactiveResourceInfo, mediaType: MediaType) =