diff --git a/script/test/HoloFlyScan.py b/script/test/HoloFlyScan.py
index f2007816..f773f042 100644
--- a/script/test/HoloFlyScan.py
+++ b/script/test/HoloFlyScan.py
@@ -52,7 +52,7 @@ try:
         ManipulatorPhi.waitValueInRange(phi, 1.0, 100)
         print time.time(), " cscan: start"
         try:
-            cscan(ManipulatorTheta, SENSORS, THETA_RANGE[0], THETA_RANGE[1], THETA_NSTEPS, time=theta_time, before_read=before_readout, after_read = after_readout)
+            cscan(ManipulatorTheta, SENSORS, THETA_RANGE[0], THETA_RANGE[1], THETA_NSTEPS - 1, time=theta_time, before_read=before_readout, after_read = after_readout)
             print time.time(), " cscan: end"
         except ContinuousScanFollowingErrorException:
             print time.time(), " cscan: exception"