diff --git a/seal5/transform/collect_immediate_operands/__init__.py b/seal5/transform/collect_immediate_operands/__init__.py
index ed754607..e0518355 100644
--- a/seal5/transform/collect_immediate_operands/__init__.py
+++ b/seal5/transform/collect_immediate_operands/__init__.py
@@ -1 +1,3 @@
 from .collect import main as CollectImmediateOperands
+
+__all__ = ["CollectImmediateOperands"]
diff --git a/seal5/transform/collect_operand_types/__init__.py b/seal5/transform/collect_operand_types/__init__.py
index 7a1dce8a..6d38473e 100644
--- a/seal5/transform/collect_operand_types/__init__.py
+++ b/seal5/transform/collect_operand_types/__init__.py
@@ -1 +1,3 @@
 from .collect import main as CollectOperandTypes
+
+__all__ = ["CollectOperandTypes"]
diff --git a/seal5/transform/collect_raises/__init__.py b/seal5/transform/collect_raises/__init__.py
index a406a457..5c7f0fc9 100644
--- a/seal5/transform/collect_raises/__init__.py
+++ b/seal5/transform/collect_raises/__init__.py
@@ -1 +1,3 @@
 from .collect import main as CollectRaises
+
+__all__ = ["CollectRaises"]
diff --git a/seal5/transform/collect_register_operands/__init__.py b/seal5/transform/collect_register_operands/__init__.py
index c1959da8..07cb4d75 100644
--- a/seal5/transform/collect_register_operands/__init__.py
+++ b/seal5/transform/collect_register_operands/__init__.py
@@ -1 +1,3 @@
 from .collect import main as CollectRegisterOperands
+
+__all__ = ["CollectRegisterOperands"]
diff --git a/seal5/transform/detect_inouts/__init__.py b/seal5/transform/detect_inouts/__init__.py
index e8b58b51..d981bd7f 100644
--- a/seal5/transform/detect_inouts/__init__.py
+++ b/seal5/transform/detect_inouts/__init__.py
@@ -1 +1,3 @@
 from .collect import main as DetectInouts
+
+__all__ = ["DetectInouts"]
diff --git a/seal5/transform/detect_side_effects/__init__.py b/seal5/transform/detect_side_effects/__init__.py
index dc6d7de9..5d129357 100644
--- a/seal5/transform/detect_side_effects/__init__.py
+++ b/seal5/transform/detect_side_effects/__init__.py
@@ -1 +1,3 @@
 from .collect import main as DetectSideEffects
+
+__all__ = ["DetectSideEffects"]
diff --git a/seal5/transform/drop_unused/__init__.py b/seal5/transform/drop_unused/__init__.py
index fc89b7e3..e3255634 100644
--- a/seal5/transform/drop_unused/__init__.py
+++ b/seal5/transform/drop_unused/__init__.py
@@ -1 +1,3 @@
 from .optimizer import main as DropUnused
+
+__all__ = ["DropUnused"]
diff --git a/seal5/transform/eliminate_mod_rfs/__init__.py b/seal5/transform/eliminate_mod_rfs/__init__.py
index af17175c..45844aca 100644
--- a/seal5/transform/eliminate_mod_rfs/__init__.py
+++ b/seal5/transform/eliminate_mod_rfs/__init__.py
@@ -1 +1,3 @@
 from .transform import main as EliminateModRFS
+
+__all__ = ["EliminateModRFS"]
diff --git a/seal5/transform/eliminate_rd_cmp_zero/__init__.py b/seal5/transform/eliminate_rd_cmp_zero/__init__.py
index 64cd4110..deca13e3 100644
--- a/seal5/transform/eliminate_rd_cmp_zero/__init__.py
+++ b/seal5/transform/eliminate_rd_cmp_zero/__init__.py
@@ -1 +1,3 @@
 from .transform import main as EliminateRdCmpZero
+
+__all__ = ["EliminateRdCmpZero"]
diff --git a/seal5/transform/explicit_truncations/__init__.py b/seal5/transform/explicit_truncations/__init__.py
index 86754e97..3cc7c893 100644
--- a/seal5/transform/explicit_truncations/__init__.py
+++ b/seal5/transform/explicit_truncations/__init__.py
@@ -1 +1,3 @@
 from .transform import main as ExplicitTruncations
+
+__all__ = ["ExplicitTruncations"]
diff --git a/seal5/transform/filter_model/__init__.py b/seal5/transform/filter_model/__init__.py
index c63f1a47..1c1ad945 100644
--- a/seal5/transform/filter_model/__init__.py
+++ b/seal5/transform/filter_model/__init__.py
@@ -1 +1,3 @@
 from .filter import main as FilterModel
+
+__all__ = ["FilterModel"]
diff --git a/seal5/transform/infer_types/__init__.py b/seal5/transform/infer_types/__init__.py
index 39b9f90b..aab0fb19 100644
--- a/seal5/transform/infer_types/__init__.py
+++ b/seal5/transform/infer_types/__init__.py
@@ -1 +1,3 @@
 from .transform import main as InferTypes
+
+__all__ = ["InferTypes"]
diff --git a/seal5/transform/optimize_instructions/__init__.py b/seal5/transform/optimize_instructions/__init__.py
index 1aaf2e6a..088fa9de 100644
--- a/seal5/transform/optimize_instructions/__init__.py
+++ b/seal5/transform/optimize_instructions/__init__.py
@@ -1 +1,3 @@
 from .optimizer import main as OptimizeInstructions
+
+__all__ = ["OptimizeInstructions"]
diff --git a/seal5/transform/process_settings/__init__.py b/seal5/transform/process_settings/__init__.py
index 47581502..b5252902 100644
--- a/seal5/transform/process_settings/__init__.py
+++ b/seal5/transform/process_settings/__init__.py
@@ -1 +1,3 @@
 from .transform import main as ProcessSettings
+
+__all__ = ["ProcessSettings"]
diff --git a/seal5/transform/simplify_trivial_slices/__init__.py b/seal5/transform/simplify_trivial_slices/__init__.py
index c79d7186..57102693 100644
--- a/seal5/transform/simplify_trivial_slices/__init__.py
+++ b/seal5/transform/simplify_trivial_slices/__init__.py
@@ -1 +1,3 @@
 from .transform import main as SimplifyTrivialSlices
+
+__all__ = ["SimplifyTrivialSlices"]