diff --git a/ayab/plugins/ayab_plugin/ayab_control.py b/ayab/plugins/ayab_plugin/ayab_control.py
index 75c59bd6..0b50ccec 100644
--- a/ayab/plugins/ayab_plugin/ayab_control.py
+++ b/ayab/plugins/ayab_plugin/ayab_control.py
@@ -148,7 +148,7 @@ def __emit_alignment(self):
   def slotSetImageDimensions(self, width, height):
     """Called by Main UI on loading of an image to set Start/Stop needle
     to image width. Updates the maximum value of the Start Line UI element"""
-    right_side = width/2
+    right_side = int(width/2)
     self.options_ui.start_needle_edit.setValue(width - right_side)
     self.options_ui.stop_needle_edit.setValue(right_side)
     self.options_ui.start_line_edit.setMaximum(height)