diff --git a/script/devices/Detector.py b/script/devices/Detector.py
index 0e9fc4b..e649f2b 100644
--- a/script/devices/Detector.py
+++ b/script/devices/Detector.py
@@ -5,10 +5,10 @@ class Detector(DeviceBase):
     def doInitialize(self):   
         pass
                 
-    def start():
+    def start(self):
         setState(State.Busy)        
     
-    def stop():
+    def stop(self):
         setState(State.Ready)
 
     def doClose(self):  
diff --git a/script/devices/StdDaq.py b/script/devices/StdDaq.py
index 7a62509..8ccf9c9 100644
--- a/script/devices/StdDaq.py
+++ b/script/devices/StdDaq.py
@@ -5,10 +5,10 @@ class StdDaq(DeviceBase):
     def doInitialize(self):   
         pass 
                 
-    def start():
+    def start(self):
         setState(State.Busy)        
     
-    def stop():
+    def stop(self):
         setState(State.Ready)
 
     def doClose(self):