diff --git a/detect.py b/detect.py
index 06083988..bf8d2e4d 100644
--- a/detect.py
+++ b/detect.py
@@ -162,7 +162,7 @@ if __name__ == '__main__':
     parser.add_argument('--weights', type=str, default='weights/yolov3-spp-ultralytics.pt', help='weights path')
     parser.add_argument('--source', type=str, default='data/samples', help='source')  # input file/folder, 0 for webcam
     parser.add_argument('--output', type=str, default='output', help='output folder')  # output folder
-    parser.add_argument('--img-size', type=int, default=416, help='inference size (pixels)')
+    parser.add_argument('--img-size', type=int, default=512, help='inference size (pixels)')
     parser.add_argument('--conf-thres', type=float, default=0.3, help='object confidence threshold')
     parser.add_argument('--iou-thres', type=float, default=0.6, help='IOU threshold for NMS')
     parser.add_argument('--fourcc', type=str, default='mp4v', help='output video codec (verify ffmpeg support)')