diff --git a/Sprinter/Sprinter.h b/Sprinter/Sprinter.h
index 9873843..66e6c59 100644
--- a/Sprinter/Sprinter.h
+++ b/Sprinter/Sprinter.h
@@ -91,6 +91,7 @@ typedef struct {
 void FlushSerialRequestResend();
 void ClearToSend();
 
+void analogWrite_check(uint8_t check_pin, int val);
 void showString (PGM_P s);
 
 void manage_inactivity(byte debug);