diff --git a/preprocessor_config.json b/preprocessor_config.json
index 81bf133..a0b4047 100644
--- a/preprocessor_config.json
+++ b/preprocessor_config.json
@@ -18,5 +18,5 @@
   "processor_class": "OwlViTProcessor",
   "resample": 3,
   "rescale": true,
-  "size": 840
+  "size": [840, 840]
 }