diff --git a/pubs/bibstruct.py b/pubs/bibstruct.py
index c8f942a..ee98b10 100644
--- a/pubs/bibstruct.py
+++ b/pubs/bibstruct.py
@@ -5,7 +5,8 @@ from .p3 import ustr, unichr
 
     # citekey stuff
 
-CONTROL_CHARS = ''.join(map(unichr, range(0, 32) + range(127, 160)))
+CONTROL_CHARS = ''.join(map(unichr,
+                            list(range(0, 32)) + list(range(127, 160))))
 CITEKEY_FORBIDDEN_CHARS = '@\'\\,#}{~%/'  # '/' is OK for bibtex but forbidden
 # here since we transform citekeys into filenames
 CITEKEY_EXCLUDE_RE = re.compile('[%s]'
diff --git a/tests/test_color.py b/tests/test_color.py
index 58ba672..0590ecf 100644
--- a/tests/test_color.py
+++ b/tests/test_color.py
@@ -1,10 +1,12 @@
 import dotdot
 from pubs import color
 
+
 def perf_color():
-    s = str(range(1000))
+    s = str(list(range(1000)))
     for _ in range(5000000):
         color.dye(s, color.red)
 
+
 if __name__ == '__main__':
     perf_color()