diff --git a/openapi/src/OpenAPI.kt b/openapi/src/OpenAPI.kt
index 3392e8d..11fcc68 100644
--- a/openapi/src/OpenAPI.kt
+++ b/openapi/src/OpenAPI.kt
@@ -6,7 +6,7 @@ import io.swagger.v3.oas.annotations.Operation
 import io.swagger.v3.oas.annotations.Parameter
 import io.swagger.v3.oas.annotations.enums.ParameterIn
 import io.swagger.v3.oas.annotations.info.Info
-import io.swagger.v3.oas.annotations.media.Schema.AccessMode
+import io.swagger.v3.oas.annotations.media.Schema.*
 import io.swagger.v3.oas.annotations.parameters.RequestBody
 import io.swagger.v3.oas.annotations.responses.ApiResponse
 import io.swagger.v3.oas.annotations.security.SecurityRequirement
@@ -161,7 +161,7 @@ private fun List<SecurityRequirement>.toSecurity() = map { mapOf(it.name to it.s
 internal fun <T: Annotation> T.toNonEmptyValues(filter: (KProperty1<T, *>) -> Boolean = { true }): MutableMap<String, Any?> = HashMap<String, Any?>().also { map ->
   publicProperties.filter(filter).forEach { p ->
     when(val v = p.valueOf(this)) {
-      "", false, 0, Int.MAX_VALUE, Int.MIN_VALUE, 0.0, Void::class.java, AccessMode.AUTO -> null
+      "", false, 0, Int.MAX_VALUE, Int.MIN_VALUE, 0.0, Void::class.java, AccessMode.AUTO, RequiredMode.AUTO, AdditionalPropertiesValue.USE_ADDITIONAL_PROPERTIES_ANNOTATION -> null
       is Enum<*> -> v.takeIf { v.name != "DEFAULT" }
       is Annotation -> v.toNonEmptyValues().takeIf { it.isNotEmpty() }
       is Array<*> -> v.map { (it as? Annotation)?.toNonEmptyValues() ?: it }.takeIf { it.isNotEmpty() }