diff --git a/gramps/plugins/lib/holidays.xml.in b/gramps/plugins/lib/holidays.xml.in
index caf674d0b..8acdf9815 100644
--- a/gramps/plugins/lib/holidays.xml.in
+++ b/gramps/plugins/lib/holidays.xml.in
@@ -404,7 +404,7 @@
     <date name="Ash Wednesday" value="> easter(y)" type="religious" offset="-46" />
     <date name="Mardi Gras" value="> easter(y)" type="religious" offset="-47" />
     <date name="Daylight Saving begins" value="> dst(y)[0]" type="informational" />
-    <date name="Income Taxes due" value="*/4/15" type="national" if="date.weekday().__cmp__(4)-1" />
+    <date name="Income Taxes due" value="*/4/15" type="national" if="cmp(date.weekday(),4)-1"/>
     <date name="Income Taxes due" value="*/4/16" type="national" if="date.weekday() == 0" />
     <date name="Income Taxes due" value="*/4/17" type="national" if="date.weekday() == 0" />
     <date name="Daylight Saving ends" value="> dst(y)[1]" type="informational" />
diff --git a/gramps/plugins/lib/libholiday.py b/gramps/plugins/lib/libholiday.py
index 5150438fc..cec9f5516 100644
--- a/gramps/plugins/lib/libholiday.py
+++ b/gramps/plugins/lib/libholiday.py
@@ -138,6 +138,12 @@ def dow(y, m, d):
     """ Return the ISO day of week for the given year, month and day. """
     return datetime.date(y, m, d).isoweekday()
 
+def cmp(a, b):
+    """
+    Replacement for older Python's cmp.
+    """
+    return (a > b) - (a < b)
+
 #------------------------------------------------------------------------
 #
 # HolidayTable