diff --git a/ice/trace.py b/ice/trace.py
index 4cd5922a..8334829a 100644
--- a/ice/trace.py
+++ b/ice/trace.py
@@ -33,7 +33,7 @@ def make_id() -> str:
 
 
 trace_dir = Path(__file__).parent.parent / "ui" / "public" / "traces"
-trace_dir.mkdir(exist_ok=True)
+trace_dir.mkdir(parents=True, exist_ok=True)
 trace_file: IO[str] | None = None