diff --git a/src/ota_metadata/legacy/__init__.py b/src/ota_metadata/legacy/__init__.py
index ff5f131de..6e383fff3 100644
--- a/src/ota_metadata/legacy/__init__.py
+++ b/src/ota_metadata/legacy/__init__.py
@@ -16,32 +16,19 @@
 
 from __future__ import annotations
 
-import importlib.util
 import sys
 from pathlib import Path
-from types import ModuleType
 
-_PROTO_DIR = Path(__file__).parent
-_PB2_FPATH = _PROTO_DIR / "ota_metafiles_pb2.py"
-_PACKAGE_PREFIX = "ota_metadata.legacy"
+from otaclient_common import import_from_file
 
+SUPORTED_COMPRESSION_TYPES = ("zst", "zstd")
 
-def _import_from_file(path: Path) -> tuple[str, ModuleType]:
-    if not path.is_file():
-        raise ValueError(f"{path} is not a valid module file")
-    try:
-        _module_name = path.stem
-        _spec = importlib.util.spec_from_file_location(_module_name, path)
-        _module = importlib.util.module_from_spec(_spec)  # type: ignore
-        _spec.loader.exec_module(_module)  # type: ignore
-        return _module_name, _module
-    except Exception:
-        raise ImportError(f"failed to import module from {path=}.")
+# ------ dynamically import pb2 generated code ------ #
 
+_PROTO_DIR = Path(__file__).parent
+_PB2_FPATH = _PROTO_DIR / "ota_metafiles_pb2.py"
+_PACKAGE_PREFIX = ".".join(__name__.split(".")[:-1])
 
-_module_name, _module = _import_from_file(_PB2_FPATH)  # noqa: F821
+_module_name, _module = import_from_file(_PB2_FPATH)
 sys.modules[_module_name] = _module
 sys.modules[f"{_PACKAGE_PREFIX}.{_module_name}"] = _module
-
-# For OTA image format legacy, we support zst,zstd compression.
-SUPORTED_COMPRESSION_TYPES = ("zst", "zstd")
diff --git a/src/otaclient_api/v2/__init__.py b/src/otaclient_api/v2/__init__.py
index 525453a23..ff3cd5252 100644
--- a/src/otaclient_api/v2/__init__.py
+++ b/src/otaclient_api/v2/__init__.py
@@ -16,34 +16,20 @@
 
 from __future__ import annotations
 
-import importlib.util
 import sys
 from pathlib import Path
-from types import ModuleType
+
+from otaclient_common import import_from_file
+
+# ------ dynamically import pb2 generated code ------ #
 
 _PROTO_DIR = Path(__file__).parent
-# NOTE: order matters here! v2_pb2_grpc depends on v2_pb2
+# NOTE: order matters here! pb2_grpc depends on pb2
 _FILES_TO_LOAD = [
-    _PROTO_DIR / _fname
-    for _fname in [
-        "otaclient_v2_pb2.py",
-        "otaclient_v2_pb2_grpc.py",
-    ]
+    _PROTO_DIR / "otaclient_v2_pb2.py",
+    _PROTO_DIR / "otaclient_v2_pb2_grpc.py",
 ]
-PACKAGE_PREFIX = "otaclient_api.v2"
-
-
-def _import_from_file(path: Path) -> tuple[str, ModuleType]:
-    if not path.is_file():
-        raise ValueError(f"{path} is not a valid module file")
-    try:
-        _module_name = path.stem
-        _spec = importlib.util.spec_from_file_location(_module_name, path)
-        _module = importlib.util.module_from_spec(_spec)  # type: ignore
-        _spec.loader.exec_module(_module)  # type: ignore
-        return _module_name, _module
-    except Exception:
-        raise ImportError(f"failed to import module from {path=}.")
+PACKAGE_PREFIX = ".".join(__name__.split(".")[:-1])
 
 
 def _import_pb2_proto(*module_fpaths: Path):
@@ -53,12 +39,10 @@ def _import_pb2_proto(*module_fpaths: Path):
     imported as modules to the global namespace.
     """
     for _fpath in module_fpaths:
-        _module_name, _module = _import_from_file(_fpath)  # noqa: F821
-        # add the module under the otaclient_api.v2 package
+        _module_name, _module = import_from_file(_fpath)
         sys.modules[f"{PACKAGE_PREFIX}.{_module_name}"] = _module
-        # add the module to the global module namespace
         sys.modules[_module_name] = _module
 
 
 _import_pb2_proto(*_FILES_TO_LOAD)
-del _import_pb2_proto, _import_from_file
+del _import_pb2_proto
diff --git a/src/otaclient_common/__init__.py b/src/otaclient_common/__init__.py
index ac7f63876..55144770d 100644
--- a/src/otaclient_common/__init__.py
+++ b/src/otaclient_common/__init__.py
@@ -16,9 +16,12 @@
 
 from __future__ import annotations
 
+import importlib.util
 import os
+import sys
 from math import ceil
 from pathlib import Path
+from types import ModuleType
 from typing import Optional
 
 from typing_extensions import Literal
@@ -58,3 +61,16 @@ def replace_root(path: str | Path, old_root: str | Path, new_root: str | Path) -
     if os.path.commonpath([path, old_root]) != old_root:
         raise ValueError(f"{old_root=} is not the root of {path=}")
     return os.path.join(new_root, os.path.relpath(path, old_root))
+
+
+def import_from_file(path: Path) -> tuple[str, ModuleType]:
+    if not path.is_file():
+        raise ValueError(f"{path} is not a valid module file")
+    try:
+        _module_name = path.stem
+        _spec = importlib.util.spec_from_file_location(_module_name, path)
+        _module = importlib.util.module_from_spec(_spec)  # type: ignore
+        _spec.loader.exec_module(_module)  # type: ignore
+        return _module_name, _module
+    except Exception:
+        raise ImportError(f"failed to import module from {path=}.")