diff --git a/src/Bounce2.h b/src/Bounce2.h
index f241616..d57b5fa 100644
--- a/src/Bounce2.h
+++ b/src/Bounce2.h
@@ -69,13 +69,13 @@ private:
 
 // Note : this is private as it migh change in the futur
 private:
+  inline void updateTime();
   inline void changeState();
   inline void setStateFlag(const uint8_t flag)       {state |= flag;}
   inline void unsetStateFlag(const uint8_t flag)     {state &= ~flag;}
   inline void toggleStateFlag(const uint8_t flag)    {state ^= flag;}
   inline bool getStateFlag(const uint8_t flag) const {return((state & flag) != 0);}
   inline bool thresholdPassed() const;
-  inline void updateTime() const;
   inline bool isDebouncing(const bool state) const;
   inline bool isUnstable(const bool state) const;
 
diff --git a/src/Debounce.cpp b/src/Debounce.cpp
index b970040..0811d63 100644
--- a/src/Debounce.cpp
+++ b/src/Debounce.cpp
@@ -210,7 +210,7 @@ inline bool Debouncer::thresholdPassed() const {
     return millis() - previous_millis >= interval_millis;
 }
 
-inline void Debouncer::updateTime() const {
+inline void Debouncer::updateTime(){
     previous_millis = millis();
 }