diff --git a/csaxs_bec/bec_widgets/widgets/slit_control/slit_control.py b/csaxs_bec/bec_widgets/widgets/slit_control/slit_control.py
index 47c200e..dbbc8ed 100644
--- a/csaxs_bec/bec_widgets/widgets/slit_control/slit_control.py
+++ b/csaxs_bec/bec_widgets/widgets/slit_control/slit_control.py
@@ -53,8 +53,8 @@ class SlitControlWidget(BECWidget, QWidget):
       updated live via Redis subscription
 
     Movement reads the current position via ``device.read()`` then dispatches
-    Movement calls ``device.set(target)`` on the device proxy, which routes
-    through to the device server — the same pattern used by XRayEye2DControl.
+    Movement calls ``device.move(target)`` — the documented BECWidget API for
+    moving a positioner (``self.dev['motor'].move(position)``).
     """
 
     PLUGIN = True
@@ -342,7 +342,7 @@ class SlitControlWidget(BECWidget, QWidget):
             reading = device.read()
             current = float(reading[dev_name]["value"])
             target = current + delta
-            device.set(target)
+            device.move(target)
         except Exception as exc:
             logger.warning(f"SlitControlWidget: failed to move {dev_name}: {exc}")