diff --git a/Assets/Raindrop/Bootstrap/RaindropBootstrapper.cs b/Assets/Raindrop/Bootstrap/RaindropBootstrapper.cs
index f416297..8534e0b 100644
--- a/Assets/Raindrop/Bootstrap/RaindropBootstrapper.cs
+++ b/Assets/Raindrop/Bootstrap/RaindropBootstrapper.cs
@@ -38,6 +38,7 @@ namespace Raindrop.Bootstrap
 #endif
         }
 
+#if UNITY_EDITOR
         /// <summary>For in-editor usage only.</summary>
         public static void InternalPlayModeStateChanged(PlayModeStateChange state)
         {
@@ -53,6 +54,7 @@ namespace Raindrop.Bootstrap
             }
         }
 
+#endif
         #region Bootstrap functions
         
         private void StartUIScene()