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;
 }
diff --git a/test-packages/01-basic-app/app/models/shim.js b/test-packages/01-basic-app/app/models/shim.js
new file mode 100644
index 000000000..26e851a82
--- /dev/null
+++ b/test-packages/01-basic-app/app/models/shim.js
@@ -0,0 +1,10 @@
+// Mimics the static apis of ShimModelClass from ember-data
+export default class Shim {
+  fields;
+  attributes;
+  relationshipsByName;
+
+  eachAttribute() {}
+  eachRelationship() {}
+  eachTransformedAttribute() {}
+}