diff --git a/daq/src/mxlibs3/jfjoch.py b/daq/src/mxlibs3/jfjoch.py
index 6faaf13d..db5d7924 100644
--- a/daq/src/mxlibs3/jfjoch.py
+++ b/daq/src/mxlibs3/jfjoch.py
@@ -51,7 +51,7 @@ class JFJochWrapper:
             step=r.incr_omega_deg,
             start=r.start_omega_deg,
             name="omega",
-            vector= [1,0,0],
+            vector= [-1,0,0],
             screening_wedge_deg = wedge
         )