diff --git a/scico/linop/_circconv.py b/scico/linop/_circconv.py
index 82d09d83f..06b155324 100644
--- a/scico/linop/_circconv.py
+++ b/scico/linop/_circconv.py
@@ -81,7 +81,7 @@ def __init__(
         ndims: Optional[int] = None,
         input_dtype: DType = snp.float32,
         h_is_dft: bool = False,
-        h_center: Optional[Union[snp.Array, np.array, Sequence, float, int]] = None,
+        h_center: Optional[Union[snp.Array, np.ndarray, Sequence, float, int]] = None,
         jit: bool = True,
         **kwargs,
     ):