diff --git a/src/services/models/Schema.ts b/src/services/models/Schema.ts
index 7e38d163..309133a7 100644
--- a/src/services/models/Schema.ts
+++ b/src/services/models/Schema.ts
@@ -244,14 +244,14 @@ function buildFields(
     sortByRequired(fields, schema.required);
   }
 
-  if (typeof additionalProps === 'object' || typeof additionalProps === 'boolean') {
+  if (typeof additionalProps === 'object' || additionalProps === true) {
     fields.push(
       new FieldModel(
         parser,
         {
           name: 'property name *',
           required: false,
-          schema: additionalProps,
+          schema: additionalProps === true ? {} : additionalProps,
           kind: 'additionalProperties',
         },
         $ref + '/additionalProperties',