diff --git a/script/device/Pixel.py b/script/device/Pixel.py
index 35d252f..abf804c 100644
--- a/script/device/Pixel.py
+++ b/script/device/Pixel.py
@@ -161,7 +161,7 @@ class Pixel(DeviceBase, Readable, Readable.IntegerType):
         sms_flag = 0        
         while (True):
             stat = self.get_status()
-            if is_status_ready(stat):
+            if self.is_status_ready(stat):
                 break
             cnt = cnt + 1
             if cnt > 1000 :