diff --git a/script/camtool.py b/script/camtool.py
index 4252e0b..99b5f96 100644
--- a/script/camtool.py
+++ b/script/camtool.py
@@ -179,7 +179,7 @@ class CamTool(DeviceBase):
             finished = True
             for retry in range(10):
                 if self.bg_capture_remain.read() >0 :
-                    finished = false
+                    finished = False
                     break
             if finished:
                 break