diff --git a/ultravox/tools/ds_tool/ds_tool.py b/ultravox/tools/ds_tool/ds_tool.py
index becb44a6..2dc6ad4c 100644
--- a/ultravox/tools/ds_tool/ds_tool.py
+++ b/ultravox/tools/ds_tool/ds_tool.py
@@ -234,7 +234,6 @@ def _run_alignment(self, temp_dir: str) -> None:
                 "align",
                 "--clean",
                 "--use_mp",
-                "--single_speaker",
                 temp_dir,
                 "english_mfa",
                 "english_mfa",