diff --git a/code/espurna/libs/pwm.h b/code/espurna/libs/pwm.h
index 1f26a1af..bf5605fb 100755
--- a/code/espurna/libs/pwm.h
+++ b/code/espurna/libs/pwm.h
@@ -9,7 +9,7 @@
  /*NOTE!!  : DO NOT CHANGE THIS FILE*/
 
  /*SUPPORT UP TO 8 PWM CHANNEL*/
-#define PWM_CHANNEL_NUM_MAX 8 
+//#define PWM_CHANNEL_NUM_MAX 8 
 
 struct pwm_param {
     uint32 period;
diff --git a/code/espurna/light.ino b/code/espurna/light.ino
index 7565f959..3200fcd2 100644
--- a/code/espurna/light.ino
+++ b/code/espurna/light.ino
@@ -13,6 +13,7 @@ Copyright (C) 2016-2017 by Xose Pérez <xose dot perez at gmail dot com>
 #include <vector>
 
 #if LIGHT_PROVIDER == LIGHT_PROVIDER_DIMMER
+#define PWM_CHANNEL_NUM_MAX LIGHT_CHANNELS
 extern "C" {
     #include "libs/pwm.h"
 }