diff --git a/index_calculator/__init__.py b/index_calculator/__init__.py
index 6514d0c..1d229ae 100644
--- a/index_calculator/__init__.py
+++ b/index_calculator/__init__.py
@@ -15,6 +15,7 @@
 from ._tables import xjson  # noqa
 from .index_calculator import IndexCalculator as index_calculator
 
+
 def _get_version():
     __version__ = "unknown"
     try:
@@ -23,6 +24,7 @@ def _get_version():
         pass
     return __version__
 
+
 __version__ = _get_version()
 
 preprocessing.__module__ = __name__
diff --git a/index_calculator/_ci_netcdfattrs.py b/index_calculator/_ci_netcdfattrs.py
index bf7724d..2e00aee 100644
--- a/index_calculator/_ci_netcdfattrs.py
+++ b/index_calculator/_ci_netcdfattrs.py
@@ -3,6 +3,7 @@
 
 import xclim as xc
 
+
 def _get_version():
     __version__ = "unknown"
     try:
@@ -11,6 +12,7 @@ def _get_version():
         pass
     return __version__
 
+
 __version__ = _get_version()