diff --git a/avr/cores/hid/USB-Core/System.cpp b/avr/cores/hid/USB-Core/System.cpp
index afc6c7f..b4fb6ae 100644
--- a/avr/cores/hid/USB-Core/System.cpp
+++ b/avr/cores/hid/USB-Core/System.cpp
@@ -27,4 +27,13 @@ THE SOFTWARE.
 // System
 //================================================================================
 
-System_ System;
\ No newline at end of file
+System_ System;
+
+void System_::press(uint8_t s){
+#ifdef USBCON
+	if (s == SYSTEM_WAKE_UP)
+		USBDevice.wakeupHost();
+	else
+#endif
+		HID_SendReport(HID_REPORTID_SYSTEMCONTROL, &s, sizeof(s));
+}
\ No newline at end of file
diff --git a/avr/cores/hid/USB-Core/System.h b/avr/cores/hid/USB-Core/System.h
index 03dca7d..7e57389 100644
--- a/avr/cores/hid/USB-Core/System.h
+++ b/avr/cores/hid/USB-Core/System.h
@@ -58,14 +58,7 @@ public:
 		press(s);
 		release();
 	}
-	inline void press(uint8_t s){
-#ifdef USBCON
-		if (s == SYSTEM_WAKE_UP)
-			USBDevice.wakeupHost();
-		else
-#endif
-			HID_SendReport(HID_REPORTID_SYSTEMCONTROL, &s, sizeof(s));
-	}
+	void press(uint8_t s);
 	inline void release(void){
 		begin();
 	}