diff --git a/py/src/pycodata/__init__.py b/py/src/pycodata/__init__.py
index 9990873..dfa03c4 100644
--- a/py/src/pycodata/__init__.py
+++ b/py/src/pycodata/__init__.py
@@ -7,8 +7,8 @@
 older values are available in dedicated modules.
 """
 from .version import __version__
-from .constants_2022 import *
-from . import constants_2022
-from . import constants_2018
-from . import constants_2014
-from . import constants_2010
+from .codata_constants_2022 import *
+from . import codata_constants_2022
+from . import codata_constants_2018
+from . import codata_constants_2014
+from . import codata_constants_2010
diff --git a/py/src/pycodata/constants_2010.py b/py/src/pycodata/codata_constants_2010.py
similarity index 100%
rename from py/src/pycodata/constants_2010.py
rename to py/src/pycodata/codata_constants_2010.py
diff --git a/py/src/pycodata/constants_2014.py b/py/src/pycodata/codata_constants_2014.py
similarity index 100%
rename from py/src/pycodata/constants_2014.py
rename to py/src/pycodata/codata_constants_2014.py
diff --git a/py/src/pycodata/constants_2018.py b/py/src/pycodata/codata_constants_2018.py
similarity index 100%
rename from py/src/pycodata/constants_2018.py
rename to py/src/pycodata/codata_constants_2018.py
diff --git a/py/src/pycodata/constants_2022.py b/py/src/pycodata/codata_constants_2022.py
similarity index 100%
rename from py/src/pycodata/constants_2022.py
rename to py/src/pycodata/codata_constants_2022.py