diff --git a/src/finam/data/cf_units.py b/src/finam/data/tools/cf_units.py
similarity index 100%
rename from src/finam/data/cf_units.py
rename to src/finam/data/tools/cf_units.py
diff --git a/src/finam/data/tools/units.py b/src/finam/data/tools/units.py
index 82f505ac5ba125ad5b4935049c22f517327cfaec..9cbd00e55f23a90a00ccc779b1e9cc24ce4e92a0 100644
--- a/src/finam/data/tools/units.py
+++ b/src/finam/data/tools/units.py
@@ -6,7 +6,7 @@ import pint
 from ...errors import FinamDataError
 
 # pylint: disable-next=unused-import
-from .. import cf_units
+from . import cf_units
 
 # set default format to cf-convention for pint.dequantify
 # some problems with degree_Celsius and similar here