diff --git a/tools/infer/utility.py b/tools/infer/utility.py
index c28816653470bc1fb1f30d200f194641018206bb..f437056ec7b10e28e626d2028b6401cebc647bb1 100644
--- a/tools/infer/utility.py
+++ b/tools/infer/utility.py
@@ -261,7 +261,7 @@ def create_predictor(args, mode, logger):
                 opt_input_shape.update(opt_pact_shape)
             elif mode == "rec":
                 min_input_shape = {"x": [1, 3, 32, 10]}
-                max_input_shape = {"x": [args.rec_batch_num, 3, 32, 1024]}
+                max_input_shape = {"x": [args.rec_batch_num, 3, 32, 1536]}
                 opt_input_shape = {"x": [args.rec_batch_num, 3, 32, 320]}
             elif mode == "cls":
                 min_input_shape = {"x": [1, 3, 48, 10]}