diff --git a/packages/model/addon/-private/system/many-array.js b/packages/model/addon/-private/system/many-array.js
index 559d2e5cdfb..4e4260dfab4 100644
--- a/packages/model/addon/-private/system/many-array.js
+++ b/packages/model/addon/-private/system/many-array.js
@@ -169,7 +169,7 @@ export default EmberObject.extend(MutableArray, DeprecatedEvented, {
     // By using `get()`, the tracking system knows to pay attention to changes that occur.
     get(this, '[]');
 
-    return this._length || 0;
+    return (Number.isInteger(this._length) && this._length) || 0;
   },
 
   set length(value) {