diff --git a/libraries/AP_RangeFinder/RangeFinder.h b/libraries/AP_RangeFinder/RangeFinder.h
index 56d0688be1..2c30dbb8e9 100644
--- a/libraries/AP_RangeFinder/RangeFinder.h
+++ b/libraries/AP_RangeFinder/RangeFinder.h
@@ -172,7 +172,6 @@ private:
     void convert_params(void);
 
     void detect_instance(uint8_t instance, uint8_t& serial_instance);
-    void update_instance(uint8_t instance);  
 
     bool _add_backend(AP_RangeFinder_Backend *driver);