diff --git a/src/Kaleidoscope.h b/src/Kaleidoscope.h
index 85ae047c..09fdbe3f 100644
--- a/src/Kaleidoscope.h
+++ b/src/Kaleidoscope.h
@@ -37,8 +37,11 @@ extern HARDWARE_IMPLEMENTATION KeyboardHardware;
 
 #define USE_PLUGINS(plugins...) Kaleidoscope.use(plugins)
 
+class Kaleidoscope_;
+
 class KaleidoscopePlugin {
- public:
+  friend Kaleidoscope_;
+ protected:
   virtual void begin(void) = 0;
 };