diff --git a/gramps/gen/db/test/test_where.py b/gramps/gen/db/test/test_where.py
index c23b4ee63..0ef4d0d62 100644
--- a/gramps/gen/db/test/test_where.py
+++ b/gramps/gen/db/test/test_where.py
@@ -19,6 +19,7 @@
 #
 
 from gramps.gen.db.where import eval_where
+from gramps.gen.lib import Person
 import unittest
 
 ##########
@@ -40,6 +41,9 @@ class Thing(object):
     def where(self):
         return lambda person: person.gramps_id == self.list[1]
 
+    def apply(self, db, person):
+        return person.gender == Person.MALE
+
 class ClosureTest(unittest.TestCase):
     def check(self, test):
         result = eval_where(test[0])
@@ -98,5 +102,9 @@ class ClosureTest(unittest.TestCase):
             (lambda person: LIKE(person.gramps_id, "I000%"),
              ["gramps_id", "LIKE", "I000%"]))
 
+    def test_11(self):
+        self.check(
+            [Thing().apply, ["gender", "==", 1]])
+
 if __name__ == "__main__":
     unittest.main()
diff --git a/gramps/gen/db/where.py b/gramps/gen/db/where.py
index e9641143b..e5d8fa4a9 100644
--- a/gramps/gen/db/where.py
+++ b/gramps/gen/db/where.py
@@ -115,6 +115,13 @@ class ParseFilter(Visitor):
         self.parameter = self.visit(node.args)[0]
         return self.visit(node.body)
 
+    def visitFunctionDef(self, node):
+        self.parameter = self.visit(node.args)[2] # ['self', 'db', 'person']
+        return self.visit(node.body)[0]
+
+    def visitReturn(self, node):
+        return self.visit(node.value)
+
     def visitarguments(self, node):
         return [self.visit(arg) for arg in node.args]