diff --git a/api/sixtyfps-node/lib/index.ts b/api/sixtyfps-node/lib/index.ts
index fcd5394d3..68b5ca26d 100644
--- a/api/sixtyfps-node/lib/index.ts
+++ b/api/sixtyfps-node/lib/index.ts
@@ -119,6 +119,8 @@ class ArrayModel<T> {
     }
 }
 
-native.ArrayModel = ArrayModel;
 
-module.exports = native;
+module.exports = {
+    private_api: native,
+    ArrayModel: ArrayModel
+};
diff --git a/tests/cases/property_animation.60 b/tests/cases/property_animation.60
index a32b2b2ab..05e703bb6 100644
--- a/tests/cases/property_animation.60
+++ b/tests/cases/property_animation.60
@@ -110,14 +110,14 @@ assert.equal(instance.hello, 40);
 assert.equal(instance.binding_dep, 100);
 
 // Half the animation
-sixtyfpslib.mock_elapsed_time(600);
+sixtyfpslib.private_api.mock_elapsed_time(600);
 assert.equal(instance.hello, 50);
 assert.equal(instance.binding_dep, 125);
 // Remaining half
-sixtyfpslib.mock_elapsed_time(600);
+sixtyfpslib.private_api.mock_elapsed_time(600);
 assert.equal(instance.hello, 60);
 assert.equal(instance.binding_dep, 150);
-sixtyfpslib.mock_elapsed_time(100);
+sixtyfpslib.private_api.mock_elapsed_time(100);
 assert.equal(instance.hello, 60);
 assert.equal(instance.binding_dep, 150);
 
@@ -125,7 +125,7 @@ assert.equal(instance.binding_dep, 150);
 // querying the value (because te dirty event should cause the animation to start)
 instance.condition = true;
 instance.hello = 30;
-sixtyfpslib.mock_elapsed_time(600);
+sixtyfpslib.private_api.mock_elapsed_time(600);
 assert.equal(instance.hello, 45);
 assert.equal(instance.binding_dep, 125);