diff --git a/stack_cfg.h b/stack_cfg.h
index a9ac027..7c2f388 100644
--- a/stack_cfg.h
+++ b/stack_cfg.h
@@ -27,7 +27,7 @@
  *  @brief  Working channel
  *          Valid value: 11 ~ 26
  */
-#define DEFAULT_CHANNEL 20
+#define DEFAULT_CHANNEL 11
 
 /**
  *  @brief  NVRAM