diff --git a/groundingdino/util/inference.py b/groundingdino/util/inference.py
index 60e038d..f4c6c92 100644
--- a/groundingdino/util/inference.py
+++ b/groundingdino/util/inference.py
@@ -154,7 +154,7 @@ class Model:
             caption=caption,
             box_threshold=box_threshold,
             text_threshold=text_threshold, 
-            device=self.model.device)
+            device=self.device)
         source_h, source_w, _ = image.shape
         detections = Model.post_process_result(
             source_h=source_h,
@@ -197,7 +197,7 @@ class Model:
             caption=caption,
             box_threshold=box_threshold,
             text_threshold=text_threshold,
-            device=self.model.device)
+            device=self.device)
         source_h, source_w, _ = image.shape
         detections = Model.post_process_result(
             source_h=source_h,