diff --git a/addon/-private/object.js b/addon/-private/object.js
index ffaa1c4..a66a299 100644
--- a/addon/-private/object.js
+++ b/addon/-private/object.js
@@ -45,7 +45,17 @@ export default class TrackedObject {
         target[prop] = value;
 
         self.#dirtyStorageFor(prop);
-        setValue(self.#collection, null);
+        self.#dirtyCollection();
+
+        return true;
+      },
+
+      deleteProperty(target, prop) {
+        if (prop in target) {
+          delete target[prop];
+          self.#dirtyStorageFor(prop);
+          self.#dirtyCollection();
+        }
 
         return true;
       },
@@ -56,13 +66,10 @@ export default class TrackedObject {
     });
   }
 
-  // @private
   #storages = new Map();
 
-  // @private
   #collection = createStorage(null, () => false);
 
-  // @private
   #readStorageFor(key) {
     let storage = this.#storages.get(key);
 
@@ -74,7 +81,6 @@ export default class TrackedObject {
     getValue(storage);
   }
 
-  // @private
   #dirtyStorageFor(key) {
     const storage = this.#storages.get(key);
 
@@ -82,4 +88,8 @@ export default class TrackedObject {
       setValue(storage, null);
     }
   }
+
+  #dirtyCollection() {
+    setValue(this.#collection, null);
+  }
 }
diff --git a/tests/unit/object-test.ts b/tests/unit/object-test.ts
index 59df68d..5e637e3 100644
--- a/tests/unit/object-test.ts
+++ b/tests/unit/object-test.ts
@@ -165,4 +165,19 @@ module('TrackedObject', function (hooks) {
       }
     }
   );
+
+  reactivityTest(
+    'delete works',
+    class extends Component {
+      obj: { foo?: number } = new TrackedObject({ foo: 1 });
+
+      get value() {
+        return this.obj.foo;
+      }
+
+      update() {
+        delete this.obj.foo;
+      }
+    }
+  );
 });