diff --git a/src/Servo.h b/src/Servo.h
index 4890a14..c478146 100644
--- a/src/Servo.h
+++ b/src/Servo.h
@@ -88,7 +88,7 @@
 #if !defined(ARDUINO_ARCH_STM32F4)
 
 typedef struct  {
-  uint8_t nbr        :6 ;             // a pin number from 0 to 63
+  uint8_t nbr        :7 ;             // a pin number from 0 to 127
   uint8_t isActive   :1 ;             // true if this channel is enabled, pin not pulsed if false 
 } ServoPin_t   ;