diff --git a/lib/ansible/plugins/filter/core.py b/lib/ansible/plugins/filter/core.py
index c0edbe03668..84e055b61f8 100644
--- a/lib/ansible/plugins/filter/core.py
+++ b/lib/ansible/plugins/filter/core.py
@@ -223,6 +223,14 @@ def get_encrypted_password(password, hashtype='sha512', salt=None):
 def to_uuid(string):
     return str(uuid.uuid5(UUID_NAMESPACE_ANSIBLE, str(string)))
 
+def mandatory(a):
+    from jinja2.runtime import Undefined
+
+    ''' Make a variable mandatory '''
+    if isinstance(a, Undefined):
+        raise errors.AnsibleFilterError('Mandatory variable not defined.')
+    return a
+
 class FilterModule(object):
     ''' Ansible core jinja2 filters '''
 
@@ -290,4 +298,6 @@ class FilterModule(object):
             # random stuff
             'random': rand,
             'shuffle': randomize_list,
+            # undefined
+            'mandatory': mandatory,
         }
diff --git a/lib/ansible/plugins/test/core.py b/lib/ansible/plugins/test/core.py
index 7de8e7436ca..daf2240211e 100644
--- a/lib/ansible/plugins/test/core.py
+++ b/lib/ansible/plugins/test/core.py
@@ -79,14 +79,6 @@ def search(value, pattern='', ignorecase=False):
     ''' Perform a `re.search` returning a boolean '''
     return regex(value, pattern, ignorecase, 'search')
 
-def mandatory(a):
-    from jinja2.runtime import Undefined
-
-    ''' Make a variable mandatory '''
-    if isinstance(a, Undefined):
-        raise errors.AnsibleFilterError('Mandatory variable not defined.')
-    return a
-
 class TestModule(object):
     ''' Ansible core jinja2 tests '''
 
@@ -102,9 +94,6 @@ class TestModule(object):
             # skip testing
             'skipped' : skipped,
 
-            # variable existence
-            'mandatory': mandatory,
-
             # regex
             'match': match,
             'search': search,