diff --git a/test_suites/ingame_play/src/InGamePlayTestInitializer.cs b/test_suites/ingame_play/src/InGamePlayTestInitializer.cs
index 053a933..71bbb0a 100644
--- a/test_suites/ingame_play/src/InGamePlayTestInitializer.cs
+++ b/test_suites/ingame_play/src/InGamePlayTestInitializer.cs
@@ -25,7 +25,7 @@ namespace Cthangover.Tools.Tests.InGamePlay
 
             driverQueued = true;
             GameLogger.Log("TEST", "InGamePlayTestInitializer: activating in-game play-test test");
-            (Godot.Engine.GetMainLoop() as SceneTree)?.Root?.CallDeferred("add_child", new InGamePlayTestDriverNode());
+            ModRoot.AddDeferred(new InGamePlayTestDriverNode());
         }
     }
 }
diff --git a/test_suites/novel_flow/src/NovelFlowTestInitializer.cs b/test_suites/novel_flow/src/NovelFlowTestInitializer.cs
index 47e70be..6f8b990 100644
--- a/test_suites/novel_flow/src/NovelFlowTestInitializer.cs
+++ b/test_suites/novel_flow/src/NovelFlowTestInitializer.cs
@@ -31,7 +31,7 @@ namespace Cthangover.Tools.Tests.NovelFlow
                 .Select(a => a.Substring("--shots=".Length))
                 .FirstOrDefault();
             GameLogger.Log("TEST", $"NovelFlowTestInitializer: activating novel_flow, shots={shots ?? "off"}");
-            (Godot.Engine.GetMainLoop() as SceneTree)?.Root?.CallDeferred("add_child", new NovelFlowTestDriver(shots));
+            ModRoot.AddDeferred(new NovelFlowTestDriver(shots));
         }
     }
 }
diff --git a/test_suites/windows/src/ToolWindowsTestInitializer.cs b/test_suites/windows/src/ToolWindowsTestInitializer.cs
index 69af2e7..f0c9e04 100644
--- a/test_suites/windows/src/ToolWindowsTestInitializer.cs
+++ b/test_suites/windows/src/ToolWindowsTestInitializer.cs
@@ -37,7 +37,7 @@ namespace Cthangover.Tools.Tests.Windows
 
             driverQueued = true;
             GameLogger.Log("TEST", $"ToolWindowsTestInitializer: activating tool windows test, shots='{shots ?? ""}'");
-            (Godot.Engine.GetMainLoop() as SceneTree)?.Root?.CallDeferred("add_child", new ToolWindowsTestDriverNode(shots));
+            ModRoot.AddDeferred(new ToolWindowsTestDriverNode(shots));
         }
     }
 }