diff --git a/av1_opus_encoder.py b/av1_opus_encoder.py
index 16413e3..35a3330 100644
--- a/av1_opus_encoder.py
+++ b/av1_opus_encoder.py
@@ -224,7 +224,7 @@ clip.set_output()
     av1an_enc_args = [
         "av1an", "-i", str(vpy_file), "-o", str(encoded_video_file), "-n",
         "-e", "svt-av1", "--resume", "--sc-pix-format", "yuv420p", "-c", "mkvmerge",
-        "--set-thread-affinity", "2", "--pix-format", "yuv420p10le", "--force",
+        "--set-thread-affinity", "2", "--pix-format", "yuv420p10le", "--force", "--no-defaults",
         "-w", str(workers),
         "-v", av1an_video_params_str
     ]