diff --git a/flashbax/buffers/prioritised_trajectory_buffer.py b/flashbax/buffers/prioritised_trajectory_buffer.py
index d93d6b1..88893a3 100644
--- a/flashbax/buffers/prioritised_trajectory_buffer.py
+++ b/flashbax/buffers/prioritised_trajectory_buffer.py
@@ -801,7 +801,7 @@ def make_prioritised_trajectory_buffer(
     init_fn = functools.partial(
         prioritised_init,
         add_batch_size=add_batch_size,
-        max_length_time_axis=max_length_time_axis,
+        max_length_time_axis=max_length_time_axis,  # type: ignore
         period=period,
     )
     add_fn = functools.partial(
diff --git a/flashbax/buffers/trajectory_buffer.py b/flashbax/buffers/trajectory_buffer.py
index a06ad45..ba005cd 100644
--- a/flashbax/buffers/trajectory_buffer.py
+++ b/flashbax/buffers/trajectory_buffer.py
@@ -588,7 +588,7 @@ def make_trajectory_buffer(
     init_fn = functools.partial(
         init,
         add_batch_size=add_batch_size,
-        max_length_time_axis=max_length_time_axis,
+        max_length_time_axis=max_length_time_axis,  # type: ignore
     )
     add_fn = functools.partial(
         add,