diff --git a/prjxray/util.py b/prjxray/util.py
index 4ff8b54a..a3316bff 100644
--- a/prjxray/util.py
+++ b/prjxray/util.py
@@ -3,6 +3,7 @@ import re
 from .roi import Roi
 from prjxray.grid import BlockType
 
+
 def get_db_root():
     # Used during tilegrid db bootstrap
     ret = os.getenv("XRAY_DATABASE_ROOT", None)
@@ -184,7 +185,8 @@ def gen_tile_bits(tile_segbits, tile, strict=False, verbose=False):
     '''
 
     for block_type in tile_segbits:
-        assert block_type.value in tile["bits"], "block type %s is not present in current tile" % block_type.value
+        assert block_type.value in tile[
+            "bits"], "block type %s is not present in current tile" % block_type.value
 
         block = tile["bits"][block_type.value]
 
@@ -196,7 +198,8 @@ def gen_tile_bits(tile_segbits, tile, strict=False, verbose=False):
             for bit in tile_segbits[block_type][tag]:
                 # 31_06
                 word_column, word_bit, isset = bit
-                assert word_column <= frames, "ERROR: bit out of bound --> word_column = %s; frames = %s" % (word_column, frames)
+                assert word_column <= frames, "ERROR: bit out of bound --> word_column = %s; frames = %s" % (
+                    word_column, frames)
                 yield word_column + baseaddr, word_bit + bitbase, tag
 
 
diff --git a/utils/checkdb.py b/utils/checkdb.py
index a4959356..20cb4944 100755
--- a/utils/checkdb.py
+++ b/utils/checkdb.py
@@ -17,7 +17,8 @@ import parsedb
 import glob
 
 
-def make_tile_mask(tile_segbits, tile_name, tilej, strict=False, verbose=False):
+def make_tile_mask(
+        tile_segbits, tile_name, tilej, strict=False, verbose=False):
     '''
     Return dict
     key: (address, bit index)