diff --git a/src/schema.ts b/src/schema.ts
index 8a212de..fb881a1 100644
--- a/src/schema.ts
+++ b/src/schema.ts
@@ -33,6 +33,7 @@ export class FarosGraphSchema {
    * Given a JSON record and a Faros model, convert the necessary date fields in
    * the record to: Javascript dates (Timestamp fields) or ISO formatted string
    * (timestamptz fields)
+   * Records for models unknown to the schema are returned unchanged
    */
   fixTimestampFields(record: Dictionary<any>, model: string): any {
     if (!isPlainObject(record)) {
@@ -54,7 +55,7 @@ export class FarosGraphSchema {
 
     const node = this.objectTypeDefs[model];
     if (!node) {
-      throw new VError('Model type %s was not found in the schema', model);
+      return record;
     }
 
     const fieldTypes = keyBy(node.fields, (n) => n.name.value);
diff --git a/test/schema.test.ts b/test/schema.test.ts
index 397f11c..97f86a5 100644
--- a/test/schema.test.ts
+++ b/test/schema.test.ts
@@ -120,4 +120,9 @@ describe('schema', () => {
         .createdAt
     ).toEqual(new Date(123));
   });
+
+  test('leaves unknown model record untouched', () => {
+    const record = {uid: 'abc'};
+    expect(schema.fixTimestampFields(record, 'unknown_Model')).toEqual(record);
+  });
 });