diff --git a/src/app/definition.h b/src/app/definition.h
index 6791b66..8022c5e 100644
--- a/src/app/definition.h
+++ b/src/app/definition.h
@@ -27,6 +27,7 @@ typedef enum {  GPIO_0 = 0,
 
 #define AP_AND_STA_ENABLED_ERR B00000001
 #define AP_SETUP_ERR B00000010
+#define STA_SETUP_ERR B00000100
 
 #define NO_ERROR 0