diff --git a/packages/ember-cli-mirage/addon/utils/ember-data.js b/packages/ember-cli-mirage/addon/utils/ember-data.js
index 801056207..a1b9300aa 100644
--- a/packages/ember-cli-mirage/addon/utils/ember-data.js
+++ b/packages/ember-cli-mirage/addon/utils/ember-data.js
@@ -11,5 +11,5 @@ export const hasEmberData =
   @hide
 */
 export function isDsModel(m) {
-  return m && typeof m.eachRelationship === 'function';
+  return m && typeof m.eachRelationship === 'function' && m.isModel === true;
 }