diff --git a/qiskit_dynamics/arraylias/register_functions/__init__.py b/qiskit_dynamics/arraylias/register_functions/__init__.py
index afde1402a..4da5fc49c 100644
--- a/qiskit_dynamics/arraylias/register_functions/__init__.py
+++ b/qiskit_dynamics/arraylias/register_functions/__init__.py
@@ -16,9 +16,6 @@
 """
 
 from .asarray import register_asarray
-from .to_dense import register_todense
-from .to_numeric_matrix_type import register_to_numeric_matrix_type
-from .to_sparse import register_tosparse
 from .matmul import register_matmul
 from .rmatmul import register_rmatmul
 from .multiply import register_multiply