diff --git a/xarray/backends/zarr.py b/xarray/backends/zarr.py
index 197f735f950..2c6b50b3589 100644
--- a/xarray/backends/zarr.py
+++ b/xarray/backends/zarr.py
@@ -293,7 +293,7 @@ def extract_zarr_variable_encoding(
     safe_chunks=True,
     region=None,
     mode=None,
-    shape=None
+    shape=None,
 ):
     """
     Extract zarr encoding dictionary from xarray Variable
@@ -348,7 +348,7 @@ def extract_zarr_variable_encoding(
         safe_chunks=safe_chunks,
         region=region,
         mode=mode,
-        shape=shape
+        shape=shape,
     )
     encoding["chunks"] = chunks
     return encoding
@@ -888,7 +888,7 @@ def set_variables(self, variables, check_encoding_set, writer, unlimited_dims=No
                 safe_chunks=self._safe_chunks,
                 region=region,
                 mode=self._mode,
-                shape=zarr_shape
+                shape=zarr_shape,
             )
 
             if name not in existing_keys: