diff --git a/supervision/detection/line_counter.py b/supervision/detection/line_counter.py
index 9cfa3d15..d12d05a1 100644
--- a/supervision/detection/line_counter.py
+++ b/supervision/detection/line_counter.py
@@ -219,3 +219,4 @@ class LineZoneAnnotator:
             self.text_thickness,
             cv2.LINE_AA,
         )
+        return frame