diff --git a/src/biocgenerics/combine.py b/src/biocgenerics/combine.py
index be45a82..08b645f 100644
--- a/src/biocgenerics/combine.py
+++ b/src/biocgenerics/combine.py
@@ -71,7 +71,6 @@ def _combine_sparse(*x):
         pass
 
 
-
 if is_package_installed("pandas") is True:
     from pandas import DataFrame, Series
 
diff --git a/src/biocgenerics/combine_rows.py b/src/biocgenerics/combine_rows.py
index 6235eca..447d6a5 100644
--- a/src/biocgenerics/combine_rows.py
+++ b/src/biocgenerics/combine_rows.py
@@ -108,7 +108,7 @@ def _combine_rows_sparse_arrays(*x):
             return _generic_combine_rows_dense_sparse(x)
 
         raise ValueError("All elements must be 2-dimensional matrices.")
-    
+
     try:
         combine_rows.register(sp.sparray, _combine_rows_sparse_arrays)
     except Exception: