diff --git a/lib/siplib.py b/lib/siplib.py
index af8b6382efc450c4e6bf92f4159bd22ab89c3cfd..9d516d87838dd0209de102d6d91d768e4e1d2212 100644
--- a/lib/siplib.py
+++ b/lib/siplib.py
@@ -907,7 +907,7 @@ class CorrelatorProcessing():
         )
 
         # Somehow this does not work in the constructor:
-        self.__pyxb_rtprocessing.channelwidth = __channelwidth
+        self.__pyxb_rtprocessing.channelWidth = __channelwidth
 
     def _get_pyxb_rtprocessing(self, suppress_warning=False):
         if not suppress_warning: