diff --git a/script/users/X-Treme users/launchOTF.py b/script/users/X-Treme users/launchOTF.py
index 95840d93..d9f8bfa6 100644
--- a/script/users/X-Treme users/launchOTF.py	
+++ b/script/users/X-Treme users/launchOTF.py	
@@ -22,7 +22,16 @@ if caget('X03DA-OP-VG7:OPEN') == 'Not_Open':
 
 caput('X03DA-OP-ST1:WT_SET_CLOSE',0)  # 
 caput('X03DA-OP-ST1:WT_SET_OPEN',1) # open ES Shutter
-time.sleep(5.0)
+
+print "check that shutter is open..."
+while True:
+    if caget('X03DA-OP-ST1:OPEN') == 'Open':
+        break
+    time.sleep(0.5)
+
+print "OK."
+
+time.sleep(3.0)
 #############################################
 
 caput('X03DA-OTF:E1', Estart)