diff --git a/avr/cores/hid/USB-Core/Keyboard.h b/avr/cores/hid/USB-Core/Keyboard.h
index 1bf159d..f166650 100644
--- a/avr/cores/hid/USB-Core/Keyboard.h
+++ b/avr/cores/hid/USB-Core/Keyboard.h
@@ -185,7 +185,7 @@ public:
 
 	size_t write(uint8_t k);
 	size_t press(uint8_t k);
-	inline size_t release(uint8_t k);
+	size_t release(uint8_t k);
 	void releaseAll(void);
 
 	size_t writeKeycode(uint8_t k);