diff --git a/gramps/gen/lib/date.py b/gramps/gen/lib/date.py
index edd3d29bd..8a672242e 100644
--- a/gramps/gen/lib/date.py
+++ b/gramps/gen/lib/date.py
@@ -53,7 +53,7 @@ log = logging.getLogger(".Date")
 from ..const import GRAMPS_LOCALE as glocale
 _ = glocale.translation.sgettext
 
-from .calendar import (gregorian_sdn, julian_sdn, hebrew_sdn, 
+from .gcalendar import (gregorian_sdn, julian_sdn, hebrew_sdn, 
                       french_sdn, persian_sdn, islamic_sdn, swedish_sdn,
                       gregorian_ymd, julian_ymd, hebrew_ymd, 
                       french_ymd, persian_ymd, islamic_ymd,
diff --git a/gramps/gen/lib/calendar.py b/gramps/gen/lib/gcalendar.py
similarity index 100%
rename from gramps/gen/lib/calendar.py
rename to gramps/gen/lib/gcalendar.py
diff --git a/gramps/plugins/lib/libholiday.py b/gramps/plugins/lib/libholiday.py
index b0d385cb5..062a9676c 100644
--- a/gramps/plugins/lib/libholiday.py
+++ b/gramps/plugins/lib/libholiday.py
@@ -28,7 +28,7 @@ from __future__ import print_function
 from gramps.gen.const import GRAMPS_LOCALE as glocale
 _ = glocale.translation.gettext
 from xml.parsers import expat
-from gramps.gen.lib.calendar import (gregorian_ymd, hebrew_sdn)
+from gramps.gen.lib.gcalendar import (gregorian_ymd, hebrew_sdn)
 import datetime
 import math
 from gramps.gen.const import PLUGINS_DIR, USER_PLUGINS
diff --git a/gramps/plugins/webreport/webcal.py b/gramps/plugins/webreport/webcal.py
index ea6b64aa5..e21fcab2c 100644
--- a/gramps/plugins/webreport/webcal.py
+++ b/gramps/plugins/webreport/webcal.py
@@ -33,7 +33,8 @@ Web Calendar generator.
 #------------------------------------------------------------------------
 from functools import partial
 import os, codecs, shutil, re, sys
-import datetime, calendar
+import datetime
+import calendar # Python module
 
 #------------------------------------------------------------------------
 # Set up logging
diff --git a/po/POTFILES.skip b/po/POTFILES.skip
index 718f0cdf0..1391b6877 100644
--- a/po/POTFILES.skip
+++ b/po/POTFILES.skip
@@ -128,7 +128,7 @@ gramps/gen/lib/addressbase.py
 gramps/gen/lib/attrbase.py
 gramps/gen/lib/attribute.py
 gramps/gen/lib/baseobj.py
-gramps/gen/lib/calendar.py
+gramps/gen/lib/gcalendar.py
 gramps/gen/lib/childref.py
 gramps/gen/lib/citationbase.py
 gramps/gen/lib/citation.py