diff --git a/script/Correlation.py b/script/Correlation.py
index 3c6869e..8bf54b5 100644
--- a/script/Correlation.py
+++ b/script/Correlation.py
@@ -11,8 +11,10 @@ if get_context().source == CommandSource.ui:
     window = 40
     p = plot(None, "Data")[0]
 
-if isinstance(dx, basestring):    dx = Channel(dx)
-if isinstance(dy, basestring):    dy = Channel(dy)
+if isinstance(dx, basestring):    
+    dx = Channel(dx) if get_device(dx) is None else get_device(dx)
+if isinstance(dy, basestring):    
+    dy = Channel(dy) if get_device(dy) is None else get_device(dy)
 
 sd=p.getSeries(0)
 sd.setLinesVisible(False)