diff --git a/script/PolSwitch.py b/script/PolSwitch.py
index 2e38dd7..038f007 100644
--- a/script/PolSwitch.py
+++ b/script/PolSwitch.py
@@ -81,7 +81,7 @@ for E in setpoints:
         else: detector4 = 0
 
         if H < 0:
-            scan1.append ([E, H], [readback1, readback2], [detector1, detector2, detector4, detector7, tey_norm])
+            scan1.append ([E, -H], [readback1, readback2], [detector1, detector2, detector4, detector7, tey_norm])
         if H > 0:
             scan2.append ([E, H], [readback1, readback2], [detector1, detector2, detector4, detector7, tey_norm])