diff --git a/unity/Runtime/Components/MjGlobalSettings.cs b/unity/Runtime/Components/MjGlobalSettings.cs
index 4510a140..6052297c 100644
--- a/unity/Runtime/Components/MjGlobalSettings.cs
+++ b/unity/Runtime/Components/MjGlobalSettings.cs
@@ -30,7 +30,8 @@ namespace Mujoco {
 public enum IntegratorType {
   Euler,
   RK4,
-  @implicit
+  @implicit,
+  @implicitfast
 }
 
 public enum CollisionCheckType {