diff --git a/src/services/__tests__/fixtures/discriminator.json b/src/services/__tests__/fixtures/discriminator.json
new file mode 100644
index 00000000..9af0d945
--- /dev/null
+++ b/src/services/__tests__/fixtures/discriminator.json
@@ -0,0 +1,67 @@
+{
+  "openapi": "3.0.0",
+  "servers": [],
+  "info": {
+    "title": "Broken Redoc Discriminator",
+    "version": ""
+  },
+  "paths": {
+    "/foo": {
+      "get": {
+        "responses": {
+          "200": {
+            "description": "OK",
+            "content": {
+              "*/*": {
+                "schema": {
+                  "$ref": "#/components/schemas/FooTopLevel"
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  },
+  "components": {
+    "schemas": {
+      "JsonApiResource": {
+        "type": "object",
+        "description": "A related resource.",
+        "required": [
+          "type"
+        ],
+        "discriminator": {
+          "propertyName": "type"
+        },
+        "properties": {
+          "type": {
+            "type": "string",
+            "description": "The type of object this resource represents."
+          }
+        }
+      },
+      "FooTopLevel": {
+        "type": "object",
+        "required": [
+          "data"
+        ],
+        "properties": {
+          "data": {
+            "$ref": "#/components/schemas/Foo"
+          }
+        }
+      },
+      "Foo": {
+        "allOf": [
+          {
+            "type": "object"
+          },
+          {
+            "$ref": "#/components/schemas/JsonApiResource"
+          }
+        ]
+      }
+    }
+  }
+}
\ No newline at end of file
diff --git a/src/services/__tests__/models/Schema.test.ts b/src/services/__tests__/models/Schema.test.ts
new file mode 100644
index 00000000..9c1c20fe
--- /dev/null
+++ b/src/services/__tests__/models/Schema.test.ts
@@ -0,0 +1,19 @@
+import { SchemaModel } from '../../models/Schema';
+import { OpenAPIParser } from '../../OpenAPIParser';
+import { RedocNormalizedOptions } from '../../RedocNormalizedOptions';
+
+const opts = new RedocNormalizedOptions({});
+
+describe('Models', () => {
+  describe('Schema', () => {
+    let parser;
+
+    test('discriminator with one field', () => {
+      const spec = require('../fixtures/discriminator.json');
+      parser = new OpenAPIParser(spec, undefined, opts);
+      const schema = new SchemaModel(parser, spec.components.schemas.Foo, '', opts);
+      expect(schema.oneOf).toHaveLength(1);
+      expect(schema.discriminatorProp).toEqual('type');
+    });
+  });
+});
diff --git a/src/services/models/Schema.ts b/src/services/models/Schema.ts
index dda8eabc..c12aa404 100644
--- a/src/services/models/Schema.ts
+++ b/src/services/models/Schema.ts
@@ -166,12 +166,12 @@ export class SchemaModel {
 
   private initDiscriminator(
     schema: OpenAPISchema & {
-      namedParents?: string[];
+      parentRefs?: string[];
     },
     parser: OpenAPIParser,
   ) {
     this.discriminatorProp = schema.discriminator!.propertyName;
-    const derived = parser.findDerived([...(schema.namedParents || []), this._$ref]);
+    const derived = parser.findDerived([...(schema.parentRefs || []), this._$ref]);
 
     if (schema.oneOf) {
       for (const variant of schema.oneOf) {