diff --git a/script/device/Mythen.py b/script/device/Mythen.py
index 8108178..5dfb418 100644
--- a/script/device/Mythen.py
+++ b/script/device/Mythen.py
@@ -54,7 +54,7 @@ class Mythen(DeviceBase, Readable):
         self.setState(State.Ready)
 
     def get_total_counts(self):
-        ret = caget( self.prefix + ":Stats5:Total_RBV", 'i') 
+        ret = caget( self.prefix + ":Stats5:Total_RBV", 'l') 
         self.setCache(ret, None)
         return ret