diff --git a/lib/irb/input-method.rb b/lib/irb/input-method.rb
index 865aad59fe..953916308e 100644
--- a/lib/irb/input-method.rb
+++ b/lib/irb/input-method.rb
@@ -363,7 +363,7 @@ module IRB
       x = cursor_pos_to_render.x + autocomplete_dialog.width
       x = cursor_pos_to_render.x - width if x + width >= screen_width
       y = cursor_pos_to_render.y + pointer - autocomplete_dialog.scroll_top
-      DialogRenderInfo.new(pos: Reline::CursorPos.new(x, y), contents: contents, bg_color: '49')
+      DialogRenderInfo.new(pos: Reline::CursorPos.new(x, y), contents: contents, width: width, bg_color: '49')
     }
 
     # Reads the next line from this input method.