diff --git a/test.py b/test.py
index 062cce0f26d9..d7eef6d5e761 100644
--- a/test.py
+++ b/test.py
@@ -282,7 +282,7 @@ def test(data,
     parser.add_argument('--weights', nargs='+', type=str, default='yolov5s.pt', help='model.pt path(s)')
     parser.add_argument('--data', type=str, default='data/coco128.yaml', help='*.data path')
     parser.add_argument('--batch-size', type=int, default=32, help='size of each image batch')
-    parser.add_argument('--img-size', type=int, default=256, help='inference size (pixels)')
+    parser.add_argument('--img-size', type=int, default=640, help='inference size (pixels)')
     parser.add_argument('--conf-thres', type=float, default=0.001, help='object confidence threshold')
     parser.add_argument('--iou-thres', type=float, default=0.6, help='IOU threshold for NMS')
     parser.add_argument('--task', default='val', help="'val', 'test', 'study'")